the maximum specific radioactivity ratios between arginine in newly synthesized protein and total free arginine in the ( 14 ) c-citrulline and ( 14 ) c-ornithine experiments indicated that only 3 % of the free arginine was in the protein precursor pool , and that argininosuccinate and citrulline were present in multiple pools .
C0033684
protein
C0033665
protein precursor