| Data Source | Format |
|---|---|
| RefSeq | NP_ or XP_, then integers |
| UniProtKB | Starts with a letter, then letters or integers |
| GeneID | Integer |
| PIR | Letter, 4 numbers |
| Mim | Integer |
| Ensemble | ENSG, then integers |
| UniGene | Species abbreviation, then integer |
| IPI | IPI, then numbers |
| UniRef 100 | UniRef100_, a letter, then letters or numbers |
| UniRef 90 | UniRef90_, a letter, then letters or numbers |
| UniRef 50 | UniRef50_, a letter, then letters or numbers |
| UniParc | Starts with 'UPI' |