in reply to Re^4: Get Fasta file with Protein Sequences given a file with Genbank Ids using Perl
in thread Get Fasta file with Protein Sequences given a file with Genbank Ids using Perl

You have not written a subroutine for write_sequence and the Bio::DB::Genbank module does not provide this method. It's likely that you want to add this to your code: 
use Bio::Perl;

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as the Bio::Perl module does provide a write_sequence method. I recommend that you carefully read the documentation for Bio::DB::Genbank and Bio::Perl.
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