Anti-ENDOU antibodies are used in the immunodetection of the protein endonuclease, poly(U) specific. In humans, the canonical protein has a reported length of 410 amino acid residues and a mass of 46.9 kDa. It has been described to be a secreted protein. Up to 3 different isoforms have been reported for this protein. It is notably expressed in the skin, placenta, oral mucosa, esophagus, and cervix. A member of the ENDOU protein family, ENDOU is a reported endoribonuclease that cleaves single-stranded RNAs at 5' of uridylates and releases a product with a 2',3'-cyclic phosphate at the 3'-end. Synonyms for this target antigen include PP11, PRSS26, uridylate-specific endoribonuclease, 22 serine protease, 26 serine protease, and P11. ENDOU gene orthologs have been reported in the mouse, rat, bovine, frog, zebrafish, chimpanzee and chicken species. Some ENDOU antibodies may have been used in research and have associated citations. Immunohistochemistry is a widely used application for these antibodies. In addition, Western Blot is also a common application.