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        If you use plots from MultiQC in a publication or presentation, please cite:

        MultiQC: Summarize analysis results for multiple tools and samples in a single report
        Philip Ewels, Måns Magnusson, Sverker Lundin and Max Käller
        Bioinformatics (2016)
        doi: 10.1093/bioinformatics/btw354
        PMID: 27312411

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        About MultiQC

        This report was generated using MultiQC, version 1.11

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        You can report bugs, suggest improvements and find the source code for MultiQC on GitHub: https://github.com/ewels/MultiQC

        MultiQC is published in Bioinformatics:

        MultiQC: Summarize analysis results for multiple tools and samples in a single report
        Philip Ewels, Måns Magnusson, Sverker Lundin and Max Käller
        Bioinformatics (2016)
        doi: 10.1093/bioinformatics/btw354
        PMID: 27312411

        A modular tool to aggregate results from bioinformatics analyses across many samples into a single report.

        Report generated on 2024-09-17, 09:48 based on data in: /work_home/orue/PROJECTS/MARCO-BOLO/PLANKTON_18S/FASTQC


        General Statistics

        Showing 374/374 rows and 3/5 columns.
        Sample Name% Dups% GCM Seqs
        RA090107_R1
        92.6%
        43%
        0.0
        RA090107_R2
        92.2%
        42%
        0.0
        RA090120_R1
        92.1%
        43%
        0.0
        RA090120_R2
        91.6%
        42%
        0.0
        RA090205_R1
        93.7%
        43%
        0.1
        RA090205_R2
        92.9%
        42%
        0.1
        RA090218_R1
        93.3%
        43%
        0.0
        RA090218_R2
        92.5%
        42%
        0.0
        RA090306_R1
        94.0%
        43%
        0.0
        RA090306_R2
        93.4%
        41%
        0.0
        RA090320_R1
        94.3%
        43%
        0.1
        RA090320_R2
        93.1%
        42%
        0.1
        RA090403_R1
        93.7%
        43%
        0.0
        RA090403_R2
        92.9%
        41%
        0.0
        RA090416_R1
        92.6%
        43%
        0.0
        RA090416_R2
        92.2%
        42%
        0.0
        RA090504_R1
        94.5%
        42%
        0.0
        RA090504_R2
        93.9%
        41%
        0.0
        RA090518_R1
        94.1%
        44%
        0.0
        RA090518_R2
        93.6%
        42%
        0.0
        RA090602_R1
        93.3%
        43%
        0.0
        RA090602_R2
        93.0%
        42%
        0.0
        RA090616_R1
        93.7%
        43%
        0.0
        RA090616_R2
        93.3%
        42%
        0.0
        RA090701_R1
        93.6%
        43%
        0.0
        RA090701_R2
        92.9%
        41%
        0.0
        RA090716_R1
        93.5%
        43%
        0.0
        RA090716_R2
        93.1%
        42%
        0.0
        RA090731_R1
        93.1%
        44%
        0.0
        RA090731_R2
        92.4%
        42%
        0.0
        RA090814_R1
        89.9%
        43%
        0.0
        RA090814_R2
        90.4%
        42%
        0.0
        RA090828_R1
        92.7%
        44%
        0.0
        RA090828_R2
        92.0%
        42%
        0.0
        RA090914_R1
        93.7%
        43%
        0.1
        RA090914_R2
        93.2%
        42%
        0.1
        RA090928_R1
        93.7%
        43%
        0.1
        RA090928_R2
        93.4%
        42%
        0.1
        RA091012_R1
        93.8%
        44%
        0.1
        RA091012_R2
        93.2%
        43%
        0.1
        RA091027_R1
        92.7%
        44%
        0.0
        RA091027_R2
        91.4%
        42%
        0.0
        RA091110_R1
        92.2%
        44%
        0.0
        RA091110_R2
        91.6%
        43%
        0.0
        RA091126_R1
        92.1%
        44%
        0.0
        RA091126_R2
        91.6%
        42%
        0.0
        RA091210_R1
        92.9%
        44%
        0.0
        RA091210_R2
        92.4%
        43%
        0.0
        RA091223_R1
        92.6%
        43%
        0.0
        RA091223_R2
        92.1%
        42%
        0.0
        RA100111_R1
        93.3%
        43%
        0.0
        RA100111_R2
        92.6%
        42%
        0.0
        RA100125_R1
        93.7%
        42%
        0.0
        RA100125_R2
        92.3%
        41%
        0.0
        RA100208_R1
        93.9%
        43%
        0.0
        RA100208_R2
        93.4%
        41%
        0.0
        RA100219_R1
        94.1%
        43%
        0.0
        RA100219_R2
        93.1%
        41%
        0.0
        RA100309_R1
        94.7%
        43%
        0.0
        RA100309_R2
        93.9%
        42%
        0.0
        RA100324_R1
        94.0%
        43%
        0.0
        RA100324_R2
        93.7%
        42%
        0.0
        RA100407_R1
        93.7%
        42%
        0.0
        RA100407_R2
        93.1%
        41%
        0.0
        RA100422_R1
        94.8%
        43%
        0.0
        RA100422_R2
        94.0%
        42%
        0.0
        RA100506_R1
        90.7%
        43%
        0.1
        RA100506_R2
        90.6%
        41%
        0.1
        RA100521_R1
        94.0%
        44%
        0.1
        RA100521_R2
        93.3%
        42%
        0.1
        RA100607_R1
        94.2%
        44%
        0.0
        RA100607_R2
        93.4%
        42%
        0.0
        RA100621_R1
        94.1%
        44%
        0.0
        RA100621_R2
        93.3%
        42%
        0.0
        RA100706_R1
        92.6%
        42%
        0.0
        RA100706_R2
        92.1%
        41%
        0.0
        RA100720_R1
        94.3%
        42%
        0.0
        RA100720_R2
        93.6%
        41%
        0.0
        RA100805_R1
        94.7%
        44%
        0.0
        RA100805_R2
        94.1%
        42%
        0.0
        RA100819_R1
        93.7%
        46%
        0.0
        RA100819_R2
        93.4%
        45%
        0.0
        RA100903_R1
        93.7%
        42%
        0.0
        RA100903_R2
        92.6%
        41%
        0.0
        RA100916_R1
        93.7%
        44%
        0.1
        RA100916_R2
        92.7%
        43%
        0.1
        RA101001_R1
        92.5%
        43%
        0.1
        RA101001_R2
        91.9%
        42%
        0.1
        RA101015_R1
        93.0%
        44%
        0.0
        RA101015_R2
        92.4%
        42%
        0.0
        RA101029_R1
        93.4%
        44%
        0.0
        RA101029_R2
        92.5%
        43%
        0.0
        RA101129_R1
        92.2%
        43%
        0.0
        RA101129_R2
        91.7%
        42%
        0.0
        RA101215_R1
        93.9%
        44%
        0.1
        RA101215_R2
        92.8%
        42%
        0.1
        RA110113_R1
        93.3%
        43%
        0.0
        RA110113_R2
        92.6%
        42%
        0.0
        RA110128_R1
        92.2%
        43%
        0.0
        RA110128_R2
        91.9%
        41%
        0.0
        RA110211_R1
        92.6%
        43%
        0.0
        RA110211_R2
        91.7%
        41%
        0.0
        RA110225_R1
        92.7%
        43%
        0.0
        RA110225_R2
        92.2%
        42%
        0.0
        RA110314_R1
        94.8%
        43%
        0.1
        RA110314_R2
        94.0%
        42%
        0.1
        RA110328_R1
        94.9%
        44%
        0.1
        RA110328_R2
        94.3%
        42%
        0.1
        RA110412_R1
        93.3%
        43%
        0.1
        RA110412_R2
        93.0%
        42%
        0.1
        RA110426_R1
        94.9%
        43%
        0.1
        RA110426_R2
        94.2%
        41%
        0.1
        RA110511_R1
        94.1%
        42%
        0.0
        RA110511_R2
        93.6%
        41%
        0.0
        RA110525_R1
        93.3%
        43%
        0.0
        RA110525_R2
        92.4%
        42%
        0.0
        RA110624_R1
        93.7%
        43%
        0.1
        RA110624_R2
        93.4%
        42%
        0.1
        RA110711_R1
        93.4%
        42%
        0.1
        RA110711_R2
        93.1%
        41%
        0.1
        RA110725_R1
        95.0%
        42%
        0.1
        RA110725_R2
        94.8%
        41%
        0.1
        RA110808_R1
        93.5%
        43%
        0.1
        RA110808_R2
        93.1%
        42%
        0.1
        RA110823_R1
        93.3%
        42%
        0.0
        RA110823_R2
        93.1%
        41%
        0.0
        RA110921_R1
        92.5%
        44%
        0.0
        RA110921_R2
        92.2%
        43%
        0.0
        RA111004_R1
        90.0%
        44%
        0.0
        RA111004_R2
        89.6%
        42%
        0.0
        RA111020_R1
        91.1%
        44%
        0.1
        RA111020_R2
        90.2%
        42%
        0.1
        RA111102_R1
        91.4%
        43%
        0.0
        RA111102_R2
        91.0%
        42%
        0.0
        RA111118_R1
        91.3%
        44%
        0.1
        RA111118_R2
        91.4%
        43%
        0.1
        RA111205_R1
        86.9%
        43%
        0.0
        RA111205_R2
        86.8%
        42%
        0.0
        RA111219_R1
        90.1%
        43%
        0.0
        RA111219_R2
        89.4%
        42%
        0.0
        RA120104_R1
        95.2%
        44%
        0.2
        RA120104_R2
        88.5%
        44%
        0.2
        RA120118_R1
        95.0%
        44%
        0.1
        RA120118_R2
        88.2%
        44%
        0.1
        RA120201_R1
        96.0%
        43%
        0.2
        RA120201_R2
        89.6%
        43%
        0.2
        RA120216_R1
        96.4%
        46%
        0.2
        RA120216_R2
        90.0%
        45%
        0.2
        RA120305_R1
        95.6%
        44%
        0.2
        RA120305_R2
        88.4%
        44%
        0.2
        RA120316_R1
        95.7%
        43%
        0.2
        RA120316_R2
        88.8%
        44%
        0.2
        RA120402_R1
        95.9%
        43%
        0.2
        RA120402_R2
        89.1%
        43%
        0.2
        RA120430_R1
        95.1%
        43%
        0.2
        RA120430_R2
        88.3%
        43%
        0.2
        RA120514_R1
        95.9%
        43%
        0.1
        RA120514_R2
        89.1%
        43%
        0.1
        RA120529_R1
        95.4%
        44%
        0.2
        RA120529_R2
        88.4%
        43%
        0.2
        RA120613_R1
        96.3%
        43%
        0.2
        RA120613_R2
        89.9%
        43%
        0.2
        RA120628_R1
        96.0%
        44%
        0.2
        RA120628_R2
        89.4%
        44%
        0.2
        RA120712_R1
        95.2%
        43%
        0.1
        RA120712_R2
        88.2%
        43%
        0.1
        RA120727_R1
        95.1%
        43%
        0.1
        RA120727_R2
        87.8%
        43%
        0.1
        RA120810_R1
        95.7%
        44%
        0.1
        RA120810_R2
        88.1%
        44%
        0.1
        RA120827_R1
        95.3%
        44%
        0.1
        RA120827_R2
        87.9%
        44%
        0.1
        RA120910_R1
        94.7%
        44%
        0.2
        RA120910_R2
        88.0%
        44%
        0.2
        RA121009_R1
        94.9%
        44%
        0.2
        RA121009_R2
        88.2%
        44%
        0.2
        RA121022_R1
        96.0%
        45%
        0.4
        RA121022_R2
        89.0%
        45%
        0.4
        RA121107_R1
        94.6%
        44%
        0.1
        RA121107_R2
        87.6%
        44%
        0.1
        RA121122_R1
        93.3%
        44%
        0.1
        RA121122_R2
        86.4%
        44%
        0.1
        RA121206_R1
        90.6%
        44%
        0.1
        RA121206_R2
        82.8%
        44%
        0.1
        RA121221_R1
        95.1%
        44%
        0.2
        RA121221_R2
        88.1%
        44%
        0.2
        RA130107_R1
        94.3%
        43%
        0.1
        RA130107_R2
        87.1%
        43%
        0.1
        RA130121_R1
        94.7%
        44%
        0.2
        RA130121_R2
        87.6%
        44%
        0.2
        RA130204_R1
        93.7%
        44%
        0.1
        RA130204_R2
        86.1%
        44%
        0.1
        RA130219_R1
        94.4%
        45%
        0.2
        RA130219_R2
        87.0%
        45%
        0.2
        RA130306_R1
        93.2%
        43%
        0.1
        RA130306_R2
        85.8%
        44%
        0.1
        RA130321_R1
        95.8%
        44%
        0.2
        RA130321_R2
        88.9%
        44%
        0.2
        RA130403_R1
        95.2%
        44%
        0.2
        RA130403_R2
        88.3%
        44%
        0.2
        RA130503_R1
        95.5%
        45%
        0.2
        RA130503_R2
        88.2%
        45%
        0.2
        RA130516_R1
        95.3%
        44%
        0.2
        RA130516_R2
        88.0%
        44%
        0.2
        RA130603_R1
        94.8%
        44%
        0.1
        RA130603_R2
        87.7%
        44%
        0.1
        RA130617_R1
        95.0%
        43%
        0.1
        RA130617_R2
        88.0%
        43%
        0.1
        RA130702_R1
        94.8%
        44%
        0.2
        RA130702_R2
        88.2%
        44%
        0.2
        RA130717_R1
        95.5%
        44%
        0.2
        RA130717_R2
        88.0%
        44%
        0.2
        RA130731_R1
        94.2%
        43%
        0.1
        RA130731_R2
        86.9%
        43%
        0.1
        RA130814_R1
        95.8%
        44%
        0.2
        RA130814_R2
        88.8%
        44%
        0.2
        RA130829_R1
        94.5%
        45%
        0.1
        RA130829_R2
        86.5%
        45%
        0.1
        RA130913_R1
        94.0%
        44%
        0.1
        RA130913_R2
        86.4%
        44%
        0.1
        RA130926_R1
        94.1%
        44%
        0.1
        RA130926_R2
        85.9%
        45%
        0.1
        RA131014_R1
        94.8%
        43%
        0.2
        RA131014_R2
        87.9%
        43%
        0.2
        RA131030_R1
        92.9%
        44%
        0.1
        RA131030_R2
        85.4%
        44%
        0.1
        RA131112_R1
        94.3%
        44%
        0.1
        RA131112_R2
        87.3%
        44%
        0.1
        RA131126_R1
        95.7%
        46%
        0.1
        RA131126_R2
        88.6%
        45%
        0.1
        RA131211_R1
        94.7%
        44%
        0.1
        RA131211_R2
        88.0%
        44%
        0.1
        RA131223_R1
        93.8%
        45%
        0.2
        RA131223_R2
        86.6%
        45%
        0.2
        RA140110_R1
        93.0%
        43%
        0.2
        RA140110_R2
        86.4%
        43%
        0.2
        RA140124_R1
        93.3%
        44%
        0.2
        RA140124_R2
        86.4%
        44%
        0.2
        RA140210_R1
        93.0%
        44%
        0.1
        RA140210_R2
        85.7%
        44%
        0.1
        RA140224_R1
        93.1%
        44%
        0.1
        RA140224_R2
        85.7%
        44%
        0.1
        RA140310_R1
        93.4%
        44%
        0.2
        RA140310_R2
        86.2%
        44%
        0.2
        RA140325_R1
        93.3%
        45%
        0.0
        RA140325_R2
        85.2%
        45%
        0.0
        RA140408_R1
        91.4%
        43%
        0.0
        RA140408_R2
        84.0%
        43%
        0.0
        RA140423_R1
        88.2%
        46%
        0.1
        RA140423_R2
        88.0%
        39%
        0.1
        RA140507_R1
        87.1%
        45%
        0.0
        RA140507_R2
        78.2%
        45%
        0.0
        RA140522_R1
        87.6%
        46%
        0.1
        RA140522_R2
        87.6%
        39%
        0.1
        RA140605_R1
        94.3%
        42%
        0.0
        RA140605_R2
        88.1%
        44%
        0.0
        RA140620_R1
        89.1%
        46%
        0.1
        RA140620_R2
        88.8%
        39%
        0.1
        RA140707_R1
        88.7%
        43%
        0.0
        RA140707_R2
        80.0%
        44%
        0.0
        RA140721_R1
        89.2%
        46%
        0.1
        RA140721_R2
        89.1%
        39%
        0.1
        RA140819_R1
        88.0%
        46%
        0.0
        RA140819_R2
        87.4%
        39%
        0.0
        RA140904_R1
        87.2%
        46%
        0.0
        RA140904_R2
        87.0%
        39%
        0.0
        RA140918_R1
        90.7%
        43%
        0.0
        RA140918_R2
        81.8%
        43%
        0.0
        RA141002_R1
        88.6%
        46%
        0.0
        RA141002_R2
        88.6%
        39%
        0.0
        RA141016_R1
        88.0%
        46%
        0.1
        RA141016_R2
        87.7%
        39%
        0.1
        RA141031_R1
        88.2%
        47%
        0.1
        RA141031_R2
        87.7%
        39%
        0.1
        RA141114_R1
        87.5%
        45%
        0.1
        RA141114_R2
        87.3%
        39%
        0.1
        RA141201_R1
        90.0%
        45%
        0.1
        RA141201_R2
        89.3%
        38%
        0.1
        RA150114_R1
        87.4%
        46%
        0.1
        RA150114_R2
        87.2%
        39%
        0.1
        RA150128_R1
        88.5%
        46%
        0.1
        RA150128_R2
        88.3%
        38%
        0.1
        RA150212_R1
        88.5%
        46%
        0.1
        RA150212_R2
        88.3%
        38%
        0.1
        RA150227_R1
        93.3%
        43%
        0.0
        RA150227_R2
        87.1%
        45%
        0.0
        RA150313_R1
        87.0%
        46%
        0.1
        RA150313_R2
        86.9%
        39%
        0.1
        RA150327_R1
        95.7%
        43%
        0.1
        RA150327_R2
        88.7%
        43%
        0.1
        RA150413_R1
        88.7%
        45%
        0.0
        RA150413_R2
        88.4%
        38%
        0.0
        RA150427_R1
        95.2%
        43%
        0.1
        RA150427_R2
        88.3%
        43%
        0.1
        RA150512_R1
        95.4%
        43%
        0.1
        RA150512_R2
        88.3%
        43%
        0.1
        RA150526_R1
        88.5%
        44%
        0.1
        RA150526_R2
        83.0%
        43%
        0.1
        RA150609_R1
        96.2%
        44%
        0.2
        RA150609_R2
        89.8%
        44%
        0.2
        RA150624_R1
        96.1%
        43%
        0.2
        RA150624_R2
        89.7%
        43%
        0.2
        RA150710_R1
        94.3%
        43%
        0.1
        RA150710_R2
        87.3%
        43%
        0.1
        RA150724_R1
        94.9%
        44%
        0.2
        RA150724_R2
        87.7%
        44%
        0.2
        RA150824_R1
        94.8%
        45%
        0.1
        RA150824_R2
        88.0%
        44%
        0.1
        RA150907_R1
        95.8%
        43%
        0.2
        RA150907_R2
        89.5%
        43%
        0.2
        RA150921_R1
        96.2%
        43%
        0.2
        RA150921_R2
        89.9%
        43%
        0.2
        RA151006_R1
        95.6%
        44%
        0.2
        RA151006_R2
        89.0%
        44%
        0.2
        RA151021_R1
        95.1%
        42%
        0.2
        RA151021_R2
        88.4%
        43%
        0.2
        RA151104_R1
        94.4%
        45%
        0.1
        RA151104_R2
        86.9%
        45%
        0.1
        RA151120_R1
        94.8%
        44%
        0.2
        RA151120_R2
        87.5%
        44%
        0.2
        RA151204_R1
        95.8%
        44%
        0.2
        RA151204_R2
        89.1%
        44%
        0.2
        RA151217_R1
        94.0%
        44%
        0.2
        RA151217_R2
        86.8%
        44%
        0.2
        RA160104_R1
        85.4%
        47%
        0.0
        RA160104_R2
        85.1%
        40%
        0.0
        RA160118_R1
        88.0%
        46%
        0.1
        RA160118_R2
        87.7%
        39%
        0.1
        RA160202_R1
        87.5%
        47%
        0.1
        RA160202_R2
        87.6%
        39%
        0.1
        RA160217_R1
        95.0%
        44%
        0.2
        RA160217_R2
        87.7%
        44%
        0.2
        RA160304_R1
        96.3%
        43%
        0.2
        RA160304_R2
        89.9%
        43%
        0.2
        RA160317_R1
        96.0%
        44%
        0.2
        RA160317_R2
        89.0%
        44%
        0.2
        RA160401_R1
        95.6%
        43%
        0.2
        RA160401_R2
        88.7%
        43%
        0.2
        RA160415_R1
        96.6%
        47%
        0.2
        RA160415_R2
        89.6%
        47%
        0.2
        RA160429_R1
        96.2%
        43%
        0.1
        RA160429_R2
        90.1%
        44%
        0.1
        RA160513_R1
        95.8%
        44%
        0.2
        RA160513_R2
        89.3%
        44%
        0.2
        RA160530_R1
        96.0%
        42%
        0.2
        RA160530_R2
        89.4%
        42%
        0.2
        RA160614_R1
        95.3%
        44%
        0.1
        RA160614_R2
        88.6%
        44%
        0.1
        RA160628_R1
        95.0%
        44%
        0.1
        RA160628_R2
        88.3%
        44%
        0.1
        RA160713_R1
        95.9%
        43%
        0.2
        RA160713_R2
        89.5%
        43%
        0.2
        RA160728_R1
        96.7%
        43%
        0.2
        RA160728_R2
        90.3%
        44%
        0.2
        RA160812_R1
        95.9%
        43%
        0.2
        RA160812_R2
        89.0%
        43%
        0.2
        RA160826_R1
        96.6%
        44%
        0.3
        RA160826_R2
        90.5%
        44%
        0.3
        RA160909_R1
        96.7%
        44%
        0.2
        RA160909_R2
        90.0%
        44%
        0.2
        RA160923_R1
        95.8%
        43%
        0.3
        RA160923_R2
        89.3%
        43%
        0.3
        RA161010_R1
        95.6%
        44%
        0.2
        RA161010_R2
        87.8%
        44%
        0.2
        RA161024_R1
        95.4%
        44%
        0.2
        RA161024_R2
        87.6%
        44%
        0.2
        RA161108_R1
        96.6%
        44%
        0.3
        RA161108_R2
        90.3%
        44%
        0.3
        RA161122_R1
        95.6%
        44%
        0.2
        RA161122_R2
        88.6%
        44%
        0.2
        RA161207_R1
        95.5%
        45%
        0.2
        RA161207_R2
        87.9%
        44%
        0.2
        RA161222_R1
        95.4%
        44%
        0.2
        RA161222_R2
        88.0%
        44%
        0.2

        FastQC

        FastQC is a quality control tool for high throughput sequence data, written by Simon Andrews at the Babraham Institute in Cambridge.

        Sequence Counts

        Sequence counts for each sample. Duplicate read counts are an estimate only.

        This plot show the total number of reads, broken down into unique and duplicate if possible (only more recent versions of FastQC give duplicate info).

        You can read more about duplicate calculation in the FastQC documentation. A small part has been copied here for convenience:

        Only sequences which first appear in the first 100,000 sequences in each file are analysed. This should be enough to get a good impression for the duplication levels in the whole file. Each sequence is tracked to the end of the file to give a representative count of the overall duplication level.

        The duplication detection requires an exact sequence match over the whole length of the sequence. Any reads over 75bp in length are truncated to 50bp for this analysis.

        Flat image plot. Toolbox functions such as highlighting / hiding samples will not work (see the docs).


        Sequence Quality Histograms

        The mean quality value across each base position in the read.

        To enable multiple samples to be plotted on the same graph, only the mean quality scores are plotted (unlike the box plots seen in FastQC reports).

        Taken from the FastQC help:

        The y-axis on the graph shows the quality scores. The higher the score, the better the base call. The background of the graph divides the y axis into very good quality calls (green), calls of reasonable quality (orange), and calls of poor quality (red). The quality of calls on most platforms will degrade as the run progresses, so it is common to see base calls falling into the orange area towards the end of a read.

        Flat image plot. Toolbox functions such as highlighting / hiding samples will not work (see the docs).


        Per Sequence Quality Scores

        The number of reads with average quality scores. Shows if a subset of reads has poor quality.

        From the FastQC help:

        The per sequence quality score report allows you to see if a subset of your sequences have universally low quality values. It is often the case that a subset of sequences will have universally poor quality, however these should represent only a small percentage of the total sequences.

        Flat image plot. Toolbox functions such as highlighting / hiding samples will not work (see the docs).


        Per Base Sequence Content

        The proportion of each base position for which each of the four normal DNA bases has been called.

        To enable multiple samples to be shown in a single plot, the base composition data is shown as a heatmap. The colours represent the balance between the four bases: an even distribution should give an even muddy brown colour. Hover over the plot to see the percentage of the four bases under the cursor.

        To see the data as a line plot, as in the original FastQC graph, click on a sample track.

        From the FastQC help:

        Per Base Sequence Content plots out the proportion of each base position in a file for which each of the four normal DNA bases has been called.

        In a random library you would expect that there would be little to no difference between the different bases of a sequence run, so the lines in this plot should run parallel with each other. The relative amount of each base should reflect the overall amount of these bases in your genome, but in any case they should not be hugely imbalanced from each other.

        It's worth noting that some types of library will always produce biased sequence composition, normally at the start of the read. Libraries produced by priming using random hexamers (including nearly all RNA-Seq libraries) and those which were fragmented using transposases inherit an intrinsic bias in the positions at which reads start. This bias does not concern an absolute sequence, but instead provides enrichement of a number of different K-mers at the 5' end of the reads. Whilst this is a true technical bias, it isn't something which can be corrected by trimming and in most cases doesn't seem to adversely affect the downstream analysis.

        Click a sample row to see a line plot for that dataset.
        Rollover for sample name
        Position: -
        %T: -
        %C: -
        %A: -
        %G: -

        Per Sequence GC Content

        The average GC content of reads. Normal random library typically have a roughly normal distribution of GC content.

        From the FastQC help:

        This module measures the GC content across the whole length of each sequence in a file and compares it to a modelled normal distribution of GC content.

        In a normal random library you would expect to see a roughly normal distribution of GC content where the central peak corresponds to the overall GC content of the underlying genome. Since we don't know the the GC content of the genome the modal GC content is calculated from the observed data and used to build a reference distribution.

        An unusually shaped distribution could indicate a contaminated library or some other kinds of biased subset. A normal distribution which is shifted indicates some systematic bias which is independent of base position. If there is a systematic bias which creates a shifted normal distribution then this won't be flagged as an error by the module since it doesn't know what your genome's GC content should be.

        Flat image plot. Toolbox functions such as highlighting / hiding samples will not work (see the docs).


        Per Base N Content

        The percentage of base calls at each position for which an N was called.

        From the FastQC help:

        If a sequencer is unable to make a base call with sufficient confidence then it will normally substitute an N rather than a conventional base call. This graph shows the percentage of base calls at each position for which an N was called.

        It's not unusual to see a very low proportion of Ns appearing in a sequence, especially nearer the end of a sequence. However, if this proportion rises above a few percent it suggests that the analysis pipeline was unable to interpret the data well enough to make valid base calls.

        Flat image plot. Toolbox functions such as highlighting / hiding samples will not work (see the docs).


        Sequence Length Distribution

        The distribution of fragment sizes (read lengths) found. See the FastQC help

        Flat image plot. Toolbox functions such as highlighting / hiding samples will not work (see the docs).


        Sequence Duplication Levels

        The relative level of duplication found for every sequence.

        From the FastQC Help:

        In a diverse library most sequences will occur only once in the final set. A low level of duplication may indicate a very high level of coverage of the target sequence, but a high level of duplication is more likely to indicate some kind of enrichment bias (eg PCR over amplification). This graph shows the degree of duplication for every sequence in a library: the relative number of sequences with different degrees of duplication.

        Only sequences which first appear in the first 100,000 sequences in each file are analysed. This should be enough to get a good impression for the duplication levels in the whole file. Each sequence is tracked to the end of the file to give a representative count of the overall duplication level.

        The duplication detection requires an exact sequence match over the whole length of the sequence. Any reads over 75bp in length are truncated to 50bp for this analysis.

        In a properly diverse library most sequences should fall into the far left of the plot in both the red and blue lines. A general level of enrichment, indicating broad oversequencing in the library will tend to flatten the lines, lowering the low end and generally raising other categories. More specific enrichments of subsets, or the presence of low complexity contaminants will tend to produce spikes towards the right of the plot.

        Flat image plot. Toolbox functions such as highlighting / hiding samples will not work (see the docs).


        Overrepresented sequences

        The total amount of overrepresented sequences found in each library.

        FastQC calculates and lists overrepresented sequences in FastQ files. It would not be possible to show this for all samples in a MultiQC report, so instead this plot shows the number of sequences categorized as over represented.

        Sometimes, a single sequence may account for a large number of reads in a dataset. To show this, the bars are split into two: the first shows the overrepresented reads that come from the single most common sequence. The second shows the total count from all remaining overrepresented sequences.

        From the FastQC Help:

        A normal high-throughput library will contain a diverse set of sequences, with no individual sequence making up a tiny fraction of the whole. Finding that a single sequence is very overrepresented in the set either means that it is highly biologically significant, or indicates that the library is contaminated, or not as diverse as you expected.

        FastQC lists all of the sequences which make up more than 0.1% of the total. To conserve memory only sequences which appear in the first 100,000 sequences are tracked to the end of the file. It is therefore possible that a sequence which is overrepresented but doesn't appear at the start of the file for some reason could be missed by this module.

        Flat image plot. Toolbox functions such as highlighting / hiding samples will not work (see the docs).


        Adapter Content

        The cumulative percentage count of the proportion of your library which has seen each of the adapter sequences at each position.

        Note that only samples with ≥ 0.1% adapter contamination are shown.

        There may be several lines per sample, as one is shown for each adapter detected in the file.

        From the FastQC Help:

        The plot shows a cumulative percentage count of the proportion of your library which has seen each of the adapter sequences at each position. Once a sequence has been seen in a read it is counted as being present right through to the end of the read so the percentages you see will only increase as the read length goes on.

        Flat image plot. Toolbox functions such as highlighting / hiding samples will not work (see the docs).


        Status Checks

        Status for each FastQC section showing whether results seem entirely normal (green), slightly abnormal (orange) or very unusual (red).

        FastQC assigns a status for each section of the report. These give a quick evaluation of whether the results of the analysis seem entirely normal (green), slightly abnormal (orange) or very unusual (red).

        It is important to stress that although the analysis results appear to give a pass/fail result, these evaluations must be taken in the context of what you expect from your library. A 'normal' sample as far as FastQC is concerned is random and diverse. Some experiments may be expected to produce libraries which are biased in particular ways. You should treat the summary evaluations therefore as pointers to where you should concentrate your attention and understand why your library may not look random and diverse.

        Specific guidance on how to interpret the output of each module can be found in the relevant report section, or in the FastQC help.

        In this heatmap, we summarise all of these into a single heatmap for a quick overview. Note that not all FastQC sections have plots in MultiQC reports, but all status checks are shown in this heatmap.

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