Anti-STEAP4 antibodies are used in the immunodetection of the protein STEAP4 metalloreductase. In humans, the canonical protein has a reported length of 459 amino acid residues and a mass of 52 kDa. Its subcellular localization is in the Golgi and cell membrane. Up to 2 different isoforms have been reported for this protein. It is ubiquitously expressed across many tissue types. A member of the STEAP protein family, STEAP4 is known to be involved with fat cell differentiation. Post-translational modifications have been described, including glycosylation. Synonyms for this target antigen include STEAP family member 4, seven chromosome locus associated with HCC, six transmembrane prostate protein 2, six-transmembrane epithelial antigen of prostate 4, and metalloreductase STEAP4. STEAP4 gene orthologs have been reported in the mouse, rat, bovine, frog, zebrafish, chimpanzee and chicken species.