Anti-RFX antibodies enable researchers to detect and measure the RFX antigen in biological samples. This target is a reported synonym of the RFX1 gene, which encodes regulatory factor X1. This protein is known to function in immune response pathways and the regulation of transcription, among other biological roles. The human version of RFX has a canonical amino acid length of 979 residues and a protein mass of 104.8 kilodaltons. It is reported to be localized in the nucleus of cells and widely expressed in many tissue types. Other names for this target antigen include EFC and MHC class II regulatory factor RFX1.