KLK4 encodes the human gene, Kallikrein related peptidase 4. It may also be known as: Kallikrein-4; Enamel matrix serine proteinase 1; Kallikrein-like protein 1; KLK-L1; Prostase; Serine protease 17; Kallikrein-4 ; AI2A1; ARM1; EMSP; EMSP1; PRSS17; PSTS; kallikrein; kallikrein-related peptidase 4. The encoded protein is an enzyme with an amino acid length of 254 and a mass of 27.0 kDa. KLK4 is a member of the Peptidase S1 family, Kallikrein subfamily. Homologs of this gene exist in other organisms, including: Mouse, Rat.