Ready-to-use ELISA kits are available for the detection of carboxypeptidase N, polypeptide 1, an alias of the protein, carboxypeptidase N subunit 1. The official gene symbol is CPN1. The protein, with a mass of 52.3 kDa and length of 458 residues, is reported to be secreted. It is a member of the Peptidase M14 family and may be known by other names, including: carboxypeptidase N polypeptide 1, carboxypeptidase N small subunit, carboxypeptidase N catalytic subunit, carboxypeptidase K, anaphylatoxin inactivator, and carboxypeptidase N catalytic chain, and kininase-1.