Anti-MAB21L4 antibodies are used in the immunodetection of the protein mab-21 like 4. In humans, the canonical protein has a reported length of 447 amino acid residues and a mass of 49.6 kDa. Up to 3 different isoforms have been reported for this protein. Synonyms for this target antigen include protein mab-21-like 4 and uncharacterized protein C2orf54. MAB21L4 gene orthologs have been reported in the mouse, rat, bovine, chimpanzee and chicken species.