KLK3

APS; PSA; hK3; KLK2A1; prostate-specific antigen; P-30 antigen; gamma-seminoprotein; kallikrein-3; semenogelase; seminin

Prostate-specific antigen (PSA), also known as gamma-seminoprotein or kallikrein-3 (KLK3), is a glycoprotein enzyme encoded in humans by the KLK3 gene. PSA is a member of the kallikrein-related peptidase family and is secreted by the epithelial cells of the prostate gland.