in several instances , higher plaque-forming cell responses were obtained with an amino acid concentration that was either higher or lower than that recommended : ( a ) the optimum concentration for valine , glutamine , and lysine lies considerably above the recommended one , ( b ) the optimum concentration for leucine as well as for several other amino acids lies below the recommended concentration , and ( c ) the optimum concentration for arginine corresponds exactly to the recommended concentration .
C0017797
glutamine
C0002520
amino acids