There are a number of ELISA Kits available for the measurement of basignin, another term for the human protein, basigin (Ok blood group). Other synonyms may include: basigin, OK blood group antigen, collagenase stimulatory factor, extracellular matrix metalloproteinase inducer, tumor cell-derived collagenase stimulatory factor, 5F7, and CD147. It is encoded by the BSG gene to yield a protein 385 amino acids in length and 42.2 kDa in size. However, there are up to 4 reported isoforms. Versions of basignin are present in other organisms, including: Mouse, Rat, Frog.