2.8.3.9	tetramer	2 * 23000 + 2 * 26000, 2 alpha and 2 beta subunits, SDS-PAGE	-, 643836, 643837	
2.8.3.9	tetramer	2 * 23300 + 2 * 25100, 2 alpha and 2 beta subunits, SDS-PAGE	-, 643838