Protein molecular weight markers-14C 1uCi in 0.01M sodium phosphate (pH 7.2), 0.01 mCi/ml, S.A. 10-100 ug/mg, Mixture of Myosin-methyl-14C methylated, Phosphorylase B-methyl-14C methylated, BSA-methyl-14C methylated, Ovalbumin-methyl-14C methylated, Carbon