Swiss-Shop - Format of a Swiss-Prot accession number (AC) or entry name (ID)
If you wish to use a sequence already referenced in a previous release of Swiss-Prot as a query, you may give its ACCESSION number here.
Example:
AC number: P30451
entry name (ID): 1A29_HUMAN
Which stands for:
HLA CLASS I HISTOCOMPATIBILITY ANTIGEN, A-29(AW-19) ALPHA CHAIN PRECURSOR