| S.NO | Uniprot ID | Protein Name | Sequence Length | Peptidase S1 Repeated Region | Function |
| 1 | Q7Z410 | Transmembrane protease serine 9 | 1059 | "Serase-1 and serase-2 are serine proteases that hydrolyze the peptides N-t-Boc-Gln-Ala-Arg-AMC and N-t-Boc-Gln-Gly-Arg-AMC. In contrast, N-t-Boc-Ala-Phe-Lys-AMC and N-t-Boc-Ala-Pro-Ala-AMC are not significantly hydrolyzed". | |
| 2 | Q2L4Q9 | Serine protease 53 | 553 | In vitro can degrade the fibrinogen alpha chain of as well as pro-urokinase-type plasminogen activator. | |
| 3 | Q5K4E3 | Polyserase-2 | 855 | "Serine protease. Hydrolyzes the peptides N-t-Boc-Gln-Ala-Arg-AMC and N-t-Boc-Gln-Gly-Arg-AMC and, to a lesser extent, N-t-Boc-Ala-Phe-Lys-AMC and N-t-Boc-Val-Leu-Lys-AMC. Has a preference for substrates with an Arg instead of a Lys residue in position P1". |