New function that reads fasta file one line at a time rather than loading the whole file
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"""Concatenates all sequences in fasta file with the same transcript ID header and then outputs a list containing sequence headers (Transcript ID) and sequences that have been concatenated.
@@ -27,3 +27,33 @@ def exon_concatenation(
@@ -27,3 +27,33 @@ def exon_concatenation(