Neurotrypsin, or Protease, serine 12, is a human gene encoded by PRSS12. It may also be known as: Neurotrypsin; Motopsin; Serine protease 12; Leydin; Neurotrypsin ; BSSP-3; BSSP3; protease, serine, 12 (neurotrypsin, motopsin). The encoded protein is an enzyme with an amino acid length of 875 and a mass of 97.1 kDa. Other isoforms may exist. Neurotrypsin is a member of the Peptidase S1 family. Homologs of this gene exist in other organisms, including: Mouse, Rat, Zebrafish, Frog, Chicken.