Abstract
Summary
1. DL-Allophenylserine has no growth-promoting effect for the white rat when added to diets deficient in phenylalanine or tyrosine. It may be inferred that it cannot be converted to either phenylalanine or tyrosine to any appreciable extent. 2. dL-Phenylserine shows a toxic action, manifested by loss of weight, when supplied to rats in a synthetic diet devoid of phenylalanine but containing tyrosine, or in a nutritionally complete lactalbumin diet. DL-allophenylserine has no appreciable effect at the same levels and under the same conditions.
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