I have a list of protein GI and would like to get accession number of the genome (DBSOURCE in genbank file) using Eutilities.

What would be the easiest way to get genome accession numbers for a list of protein GI?
<p>For future reference:</p>

<p>There is an interesting file @NCBI which contains information about various accession numbers/gene names: ftp://ftp.ncbi.nlm.nih.gov/gene/DATA/gene2accession.gz</p>

<p>This file is automatically generated everyday and should contain latest information about GeneID&#39;s and accession numbers.</p>
