1. Adamstone, F. B., and H. Spector: Tryptophan deficiency in the rat: Histologic changes induced by feeding of an acid-hydrolysed casein diet. Arch. Path. 49, 173?184 (1950).
2. Ambrose, A. M., D. J. Robbins and F. De Eds: Acute and sub-acute toxicity of amino hexose reductones. Proc. Soc. exp. Biol. (N.Y.) 106, 656?659 (1960).
3. Blaschko, H., and T. L. Crusciel: The decarboxylation of ammo-acids related to tyrosine and their awakening action in reserpine treated mice. J. Physiol. (Lond.) 151, 272?284 (1960).
4. Bogdanski, D. F., A. Pletscher, B. B. Brodie and S. Udenfriend: Identification and assay of serotonin in brain. J. Pharmacol. exp. Ther. 117, 82?88 (1956).
5. ?, H. Weissbach and S. Udenfriend: Pharmacological studies with the serotonin precursor 5-hydroxytryptophan. J. Pharmacol. exp. Ther. 122, 182?194 (1958).