A Nervous Syndrome Produced with Phenylalanine and Methionine.

Abstract
Animals fed a niacin-tryptophan deficient ration supplemented with 0.208% DL-phenylalanine and 0.2% DL-methionine for a period of 12 weeks developed a nervous syndrome. Generous quantities of tryptophan or niacin in the ration protected the animals from this syndrome, but neither compound cured the symptoms once they had progressed beyond a given stage.

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