Thanks for the reply. But the code was not what I was looking for. Basically I just want to figure out the length of each sequence in a multifasta file. The files contains many sequences, each sequence has new lines inside, and I want to know how many nucleotides each sequence is and then extract only the sequences with more than x number of nt. Not sure if that makes sense? How to figure out the length of a sequence from a multifasta sequence file? Thanks!

In reply to Re^2: Size of sequences in fastafile by Sofie
in thread Size of sequences in fastafile by Sofie

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