Anti-RUNX1 partner transcriptional co-repressor 1 antibodies are used for the immunodetection of the protein encoded by the RUNX1T1 gene. In humans, the canonical protein has a reported length of 604 amino acid residues and a mass of 67.6 kDa. Its subcellular localization is in the nucleus. Alternative splicing is reported to yield 6 different isoforms for this protein. A member of the CBFA2T protein family, it is reported to be a transcriptional corepressor, which facilitates transcriptional repression via its association with DNA-binding transcription factors and recruitment of other corepressors and histone-modifying enzymes. Other names for this target antigen include AML1T1, CBFA2T1, CDR, ETO, MTG8, ZMYND2, protein CBFA2T1, and AML1-MTG8. Gene orthologs have been identified in the mouse, rat, bovine, frog, zebrafish, chimpanzee and chicken species.