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  • bowtie - reads aligned does not match reported alignments

    Hi,

    A bowtie question of output interpretation,

    CMD:

    bowtie -p 16 -a --best --strata -q -S --sam-nohead -q -v 2 target single_dir/single_fa > single_dir/single_fa.pre.sam

    STDERR:

    # reads processed: 32354340
    # reads with at least one reported alignment: 15905262 (49.16%)
    # reads that failed to align: 16449078 (50.84%)
    Reported 24030582 alignments to 1 output stream(s)

    I could only locate a few examples online of bowtie stderr, and in the singular stderr example in the bowtie manual the #reads reported = # alignments.

    Is it that in the event of a tie (two alignments equally as "good") that both are reported?

    What I would like is for all alignments to be considered ("-a"), yet only those reported that are best for each read (presumably "--best --strata"). I've tried adding "-k 1" to the command above, but the output is identical.

    Any suggestions/interpretations?

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