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Reductive methylation has been used to radioactively label crude-extract proteins with 3H or 14C. The procedure achieved good isotope incorporation and resolution of proteins on two-dimensional polyacrylamide gels. It allows high-precision comparison of tissue samples by double-labelling and should facilitate the study of tissue proteins by two-dimensional gel electrophoresis.
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Finger et al. (1981) studied this question.
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