Anti-regulatory factor X1 antibodies are used for the immunodetection of the protein encoded by the RFX1 gene. In humans, the canonical protein has a reported length of 979 amino acid residues and a mass of 104.8 kDa. Its subcellular localization is in the nucleus. A member of the RFX protein family, it is known to be involved with immune response pathways and the regulation of transcription. Other names for this target antigen include RFX, MHC class II regulatory factor RFX1, MHC class II regulatory factor RFX, enhancer factor C, and EFC. Gene orthologs have been identified in the mouse, rat, bovine, frog and chimpanzee species. A number of regulatory factor X1 antibodies have been mentioned in research publications and have associated citations. Western Blot is a widely used application for these antibodies. ELISA and Immunofluorescence are also common applications.