Anti-XKR4 antibodies are used in the immunodetection of the protein XK related 4. In humans, the canonical protein has a reported length of 650 amino acid residues and a mass of 71.5 kDa. Its subcellular localization is in the cell membrane. A member of the XK protein family, XKR4 is known to be involved with the apoptotic pathway. Post-translational modifications have been described, including protein cleavage. Synonyms for this target antigen include X Kell blood group precursor-related family, member 4, X-linked Kx blood group related 4, XK, Kell blood group complex subunit-related family, member 4, and XK-related protein 4. XKR4 gene orthologs have been reported in the mouse, rat, bovine, frog, zebrafish, chimpanzee and chicken species. Immunohistochemistry is the most common application for the XKR4 antibodies listed below. ELISA, Western Blot, and Immunofluorescence are also common applications.