Anti-CK23 antibodies enable researchers to detect and measure the CK23 antigen in biological samples. This target is a reported synonym of the KRT23 gene, which encodes keratin 23. This protein is known to function in epithelial cell differentiation, among other biological roles. The human version of CK23 has a canonical amino acid length of 422 residues and a protein mass of 48.1 kilodaltons, although 2 isoforms have been identified. It is reported to be notably expressed in many tissues, such as the endometrium, urinary bladder, and endometrium 1. This target antigen may also be known as HAIK1.