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