Anti-La ribonucleoprotein 4 antibodies are used for the immunodetection of the protein encoded by the LARP4 gene. In humans, the canonical protein has a reported length of 724 amino acid residues and a mass of 80.6 kDa. Its subcellular localization is in the cytoplasm. Alternative splicing is reported to yield 7 different isoforms for this protein. It is noted to be involved in cytoskeleton organization and protein translation. Other names for this target antigen include La ribonucleoprotein domain family member 4, c-Mpl binding protein, and la-related protein 4. Gene orthologs have been identified in the mouse, rat, bovine, frog, chimpanzee and chicken species.