Get nucleotide sequence from protein refseq

Question

[cindyfang70]

For my current project I need to get the nucleotide sequence of a protein. I have the protein's refseq. I originally tried using Entrez Efetch and the gene ID, but gene ID now seems to be outdated. Is there a better way to go about this?

Thanks in advance!

[skjobs]

Use biodbnet to convert biological ID and then you can fetch from entrez or other site.

https://biodbnet-abcc.ncifcrf.gov/db/db2db.php

[GenoMax]

Can you post the accession number?