There are a number of ELISA Kits available for the measurement of protease, serine, 1 (trypsin 1), another term for the human protein, serine protease 1. Other synonyms may include: trypsin-1, TCR V beta 4.1, beta-trypsin, cationic trypsinogen, nonfunctional trypsin 1, protease serine 1, and trypsinogen 1. It is encoded by the PRSS1 gene to yield a protein 247 amino acids in length and 26.6 kDa in size. The protein, an enzyme, is categorized into the Peptidase S1 family. Versions of protease, serine, 1 (trypsin 1) are present in other organisms, including: Mouse, Fly.