My understanding, feeble as it is, of the FASTA file format is that the base sequence portion of a FASTA record in such a file is of indeterminate length and can be multi-line, e.g., something like: 

...
>4c2a958...
TCCCCACGCTTTCGCGCTTC...
TAGTAGTAGTAGTAG...
...
>0639b5b...
...

[download]

I think it should be noted that your solution++ reverse-complements the DNA sequence on a line-by-line basis, so the entire DNA sequence of a FASTA record (possibly many lines of varying length) will not, as I understand it, be correctly processed.

Give a man a fish:  <%-{-{-{-<

In reply to Re^2: Perl code for reverse complement of DNA sequence by AnomalousMonk
in thread Perl code for reverse complement of DNA sequence by mashuk

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