Anti-K19 antibodies enable researchers to detect and measure the K19 antigen in biological samples. This target is a reported synonym of the KRT19 gene, which encodes keratin 19. This protein is known to function in epithelial cell differentiation and the Notch signaling pathway, among other biological roles. The human version of K19 has a canonical amino acid length of 400 residues and a protein mass of 44.1 kilodaltons. It is reported to be widely expressed in many tissue types. Other names for this target antigen include CK19 and K1CS. Some K19 antibodies may have been used in research and have associated citations. ELISA, Western Blot, and Immunohistochemistry are common applications for these antibodies.