Anti-PPID antibodies are used in the immunodetection of the protein peptidylprolyl isomerase D. In humans, the canonical protein has a reported length of 370 amino acid residues and a mass of 40.8 kDa. Its subcellular localization is in the nucleus and cytoplasm. It is widely expressed across many tissue types. A member of the Cyclophilin-type PPIase protein family, PPID is a reported PPIase that catalyzes the cis-trans isomerization of proline imidic peptide bonds in oligopeptides and may therefore assist protein folding. Synonyms for this target antigen include CYPD, peptidyl-prolyl cis-trans isomerase D, 40 kDa peptidyl-prolyl cis-trans isomerase D, PPIase D, cyclophilin 40, and CYP-40. PPID gene orthologs have been reported in the mouse, rat, bovine, frog, zebrafish, chimpanzee and chicken species. Over 60 citations in the literature describe the use of PPID antibodies in research. Western Blot is a widely used application for these antibodies. ELISA, Immunofluorescence, and Immunohistochemistry are also common applications.