Re: Get Fasta file with Protein Sequences given a file with Genbank Ids using Perl

Looking at the documentation for Bio::DB::GenBank, it states

DESCRIPTION
Allows the dynamic retrieval of the Bio::Seq manpage sequence objects 
+from the GenBank database at NCBI, via an Entrez query.

WARNING: Please do NOT spam the Entrez web server with multiple reques
+ts. NCBI offers Batch Entrez for this purpose.
[download]

So I don't know if this applies to your situation because you're only downloading 4 sequences. The page for NCBI has some examples of downloads.

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