- Protein Identifier
- The protein identifier appeared as a /note feature qualifier in Release 43 (e.g. /note="pid:g2285). It was superceded by a /db_xref feature qualifier in Release 45 (e.g. /db_xref="PID:g2285"). It was superceded by a /protein_id feature qualifier in release 58 (e.g. /protein_id="CAA03857.1"). Queries are converted to uppercase by default, so users should tick the "case sensitive" box when querying by pid or PID.