Anti-PDIA4 antibodies are used in the immunodetection of the protein protein disulfide isomerase family A member 4. In humans, the canonical protein has a reported length of 645 amino acid residues and a mass of 72.9 kDa. Its subcellular localization is in the ER. A member of the Protein disulfide isomerase protein family, it is known to be involved with protein folding. Synonyms for this target antigen include ERP72, ERp-72, protein disulfide-isomerase A4, ER protein 70, ER protein 72, and ERP70.