A group of lysosomal proteinases or endopeptidases found in aqueous extracts of a variety of animal tissues. They function optimally within an acidic pH range. The cathepsins occur as a variety of enzyme subtypes including SERINE PROTEASES; ASPARTIC PROTEINASES; and CYSTEINE PROTEASES. (mesh:D002403)
| Synonym | Reference | Specificity |
| cathepsin | Exact | |
| cathepsins | Exact |
| Identifier | Name | Relation |
| HGNC:2538 | CTSV | isa |
| HGNC:2542 | CTSO | isa |
| HGNC:2532 | CTSG | isa |
| HGNC:2527 | CTSB | isa |
| HGNC:2530 | CTSE | isa |
| HGNC:2535 | CTSH | isa |
| HGNC:2545 | CTSS | isa |
| HGNC:2546 | CTSW | isa |
| HGNC:9251 | CTSA | isa |
| HGNC:2531 | CTSF | isa |
| HGNC:2529 | CTSD | isa |
| HGNC:2528 | CTSC | isa |
| HGNC:2537 | CTSL | isa |
| HGNC:2547 | CTSZ | isa |
| HGNC:2536 | CTSK | isa |