Anti-ectonucleoside triphosphate diphosphohydrolase 5 (inactive) antibodies are used for the immunodetection of the protein encoded by the ENTPD5 gene. In humans, the canonical protein has a reported length of 428 amino acid residues and a mass of 47.5 kDa. Its subcellular localization is in the ER and is secreted. It is reported to be expressed in adult liver, kidney, prostate, testis and colon. A member of the GDA1/CD39 NTPase protein family, it is known to be involved with carbohydrate metabolism and homeostasis. Post-translational modifications have been described, including N-glycosylation. Other names for this target antigen include NTPDase-5, PCPH, nucleoside diphosphate phosphatase ENTPD5, CD39 antigen-like 4, CD39-like 4, and CD39L4. Gene orthologs have been identified in the mouse, rat, bovine, frog, zebrafish, chimpanzee and chicken species.