Anti-CTR9 antibodies are used in the immunodetection of the protein CTR9 homolog, Paf1/RNA polymerase II complex component. In humans, the canonical protein has a reported length of 1173 amino acid residues and a mass of 133.5 kDa. Its subcellular localization is in the nucleus. It is widely expressed across many tissue types. CTR9 is a known component of the PAF1 complex (PAF1C) which has multiple functions during transcription by RNA polymerase II and is implicated in regulation of development and maintenance of embryonic stem cell pluripotency. Synonyms for this target antigen include TSBP, p150, p150TSP, RNA polymerase-associated protein CTR9 homolog, and SH2BP1. CTR9 gene orthologs have been reported in the mouse, rat, bovine, frog, zebrafish, chimpanzee and chicken species. A number of CTR9 antibodies have been mentioned in research publications and have associated citations. Immunofluorescence is a widely used application for these antibodies. Western Blot and Immunohistochemistry are also common applications.