the rates of incorporation of [ ( 75 ) se ] selenomethionine and [ ( 14 ) c ] methionine were similar when measured separately , but [ ( 75 ) se ] selenomethionine incorporation was 35 % less than [ ( 14 ) c ] methionine incorporation when both amino acids were present in equal molar concentrations .
C0036584
selenomethionine
C0025646
methionine