Anti-KLK1 antibodies are used in the immunodetection of the protein kallikrein 1. In humans, the canonical protein has a reported length of 262 amino acid residues and a mass of 28.9 kDa. Up to 2 different isoforms have been reported for this protein. It is notably expressed in the rectum, pancreas, colon, appendix, and adrenal gland. It is a member of the Peptidase S1 protein family. Post-translational modifications have been described, including glycosylation. Synonyms for this target antigen include Klk6, hK1, glandular kallikrein 1, kallikrein 1, renal/pancreas/salivary, kallikrein serine protease 1, and KLKR. KLK1 gene orthologs have been reported in the mouse, rat, bovine and chimpanzee species. A number of KLK1 antibodies have been mentioned in research publications and have associated citations. ELISA, Western Blot, and Immunohistochemistry are common applications for these antibodies.