Anti-PEX3 antibodies are used in the immunodetection of the protein peroxisomal biogenesis factor 3. In humans, the canonical protein has a reported length of 373 amino acid residues and a mass of 42.1 kDa. Its subcellular localization is in the peroxisomes. It is reported to be found in all examined tissues. A member of the Peroxin-3 protein family, PEX3 is known to be involved in peroxisome biosynthesis and integrity. The PEX3 gene has been associated with the disease, Peroxisome biogenesis disorder. Synonyms for this target antigen include PBD10B, TRG18, peroxin-3, peroxisomal assembly protein PEX3, transformation-related protein 18, and PBD10A. PEX3 gene orthologs have been reported in the mouse, rat, bovine, frog, zebrafish, chimpanzee and chicken species.