Anti-ADP-ribosyltransferase 4 (inactive) (Dombrock blood group) antibodies are used for the immunodetection of the protein encoded by the ART4 gene. In humans, the canonical protein has a reported length of 314 amino acid residues and a mass of 35.9 kDa. Its subcellular localization is in the cell membrane. It is reported to be expressed in spleen and T-cells. A member of the Arg-specific ADP-ribosyltransferase protein family, it is known to be involved with metabolic processes. Post-translational modifications have been described, including glycosylation. Other names for this target antigen include CD297, DO, DO/ART4, DOK1, ecto-ADP-ribosyltransferase 4, and ARTC4. Gene orthologs have been identified in the mouse, rat, bovine, chimpanzee and chicken species.