Anti-chymotrypsin like antibodies are used in the immunodetection of the protein encoded by the CTRL gene. In humans, the canonical protein has a reported length of 264 amino acid residues and a mass of 28 kDa. A member of the Peptidase S1 protein family, it is known to be involved with proteolysis. Post-translational modifications have been described, including glycosylation. Other names for this target antigen include CTRL1 and chymotrypsin-like protease CTRL-1.