5.5.1.2 ? x * 37000, SDS-PAGE -, 679754 5.5.1.2 ? x * 40000, SDS-PAGE 3666 5.5.1.2 ? x * 42000, SDS-PAGE -, 681790 5.5.1.2 homotetramer x-ray crystallography 661079 5.5.1.2 octamer 8 * 23000-25000, SDS-PAGE, equilibrium sedimentation of enzyme treated with 5 M guanidine-HCl and 0.01% v/v 2-mercaptoethanol 3663 5.5.1.2 tetramer - 661079