[BiO BB] Where can I get the matching information between RefSeq mRNA and RefSeq Protein?

[Siddhartha Basu]

Zheng Fu wrote:
> Most of RefSeq mRNA have accession No. starting with "NM_", while RefSeq
> Proteins' accession No. starting with "NP_". How can I get a
> correspondence information between "NM_" and its product "NP_" for all the
> genes of H. Sapiens and M. Musculus?  Thanks.
> 
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Download this file from here:
ftp://ftp.ncbi.nlm.nih.gov/gene/DATA/gene2refseq.gz

Extract columns 4 and 6 for NP_ and NM_ correspondence. Use column 1 for 
filtering out your desired species.

-sidd