Ready-to-use ELISA kits are available for the detection of transcription factor 20 (AR1), an alias of the protein, transcription factor 20. The official gene symbol is TCF20. The protein, with a mass of 211.8 kDa and length of 1960 residues, is reported to be nuclear. It may be known by other names, including: SPBP, DDVIBA, stromelysin-1 platelet-derived growth factor-responsive element binding protein, nuclear factor SPBP, and SPRE-binding protein.