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  • Bowtie start positions greater than index lengths

    I created a fasta file of 50 nt sequences and ran bowtie-build to create an index.

    bowtie-build fasta.fa fasta_index

    This generated 6 files correctly. Next, I aligned a set of reads to the fasta_index.

    bowtie fasta_index -t -v 2 reads.fq output.map

    Looking at the output.map file, some of the start positions report 200+. How can the start positions be 200+ if the fasta_index sequences are 50 nt long?

  • #2
    Any chance there's something goofy with the FASTA file?
    /* Shawn Driscoll, Gene Expression Laboratory, Pfaff
    Salk Institute for Biological Studies, La Jolla, CA, USA */

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