“…DNA content in muscle is not decreased by a protein-free diet (Howarth and Baldwin, 1971;Wannemacher and Allison, 196 8). Both total and microsomal RNA but not tRNA are related to rate of muscle protein synthesis (Howarth, 1972). Therefore, it has been concluded that rRNA concentra-' tion, which is the major proportion of microsomal RNA, is a major determinant of the rate of muscle protein synthesis (Allsion et al, 1963;Wannemacher and Allison, 1968).…”