Anti-PZ antibodies enable researchers to detect and measure the PZ antigen in biological samples. This target is a reported synonym of the PROZ gene, which encodes protein Z, vitamin K dependent plasma glycoprotein. This protein is known to function in proteolysis, among other biological roles. The human version of PZ has a canonical amino acid length of 400 residues and a protein mass of 44.7 kilodaltons, although 2 isoforms have been identified. It is reported to be a secreted protein that is notably expressed in the liver. PZ is a member of the Peptidase S1 protein family.