Dietary Tryptophan and Blood Gamma-globulin Level

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Abstract
Normal growth of young rats could be sustained by a diet containing 0.1% tryptophan. Additional tryptophan did not improve the weight gain. However, dietary tryptophan content of 0.1% was apparently not enough to maintain a high level of serum and liver protein in spite of the normal growth. The level of gamma-globulin in animals fed on diet containing 0.2% of tryptophan was substantially higher than in those fed on diets containing 0.08 or 0.1% of tryptophan.