SGD_CDS_xref.txt : This space-delimited file contains SGD xref update information for CDS entries in GenBank/EMBL/DDBJ and is updated for each new genome version release. The SGDID is the recommended identifier for features in SGD. Columns are: 1) Accession Number 2) PROTEIN_ID of CDS 3) SGDID 4) Standard S. cerevisiae ORF Name