Anti-SUB1 antibodies are used in the immunodetection of the protein SUB1 regulator of transcription. In humans, the canonical protein has a reported length of 127 amino acid residues and a mass of 14.4 kDa. Its subcellular localization is in the nucleus. It is notably widely expressed in many tissue types. A member of the Transcriptional coactivator PC4 protein family, SUB1 is reported to be a general coactivator that functions cooperatively with TAFs and mediates functional interactions between upstream activators and the general transcriptional machinery. Synonyms for this target antigen include PC4, activated RNA polymerase II transcriptional coactivator p15, SUB1 homolog, transcriptional regulator, activated RNA polymerase II transcription cofactor 4, and P15. SUB1 gene orthologs have been reported in the mouse, rat, bovine, frog, zebrafish, chimpanzee and chicken species. A number of SUB1 antibodies have been mentioned in research publications and have associated citations. Western Blot is a widely used application for these antibodies. ELISA, Immunofluorescence, and Immunohistochemistry are also common applications.