tokens: Sodium dodecyl sulfate-polyacrylamide gel electrophoresis of [ 3H ] DM-labeled IM-9 cytosol identified a major competable band with a molecular weight of approximately 90 , 000 , three minor competable components with molecular weights of approximately 78 , 000 , approximately 51 , 000 , and approximately 38 , 500 , and at least 21 other noncompetable components .