Journal of Physiology, 1906, v.35, pp. 88-102
Demonstration of the importance of tryptophan in diet. The pioneer of Hopkins led eventually to the discovery of vitamins.
Morton no.: 732
Willcock, Edith Gertrude and Hopkins, Sir Frederick Gowland, "The importnace of individual amino-acids in metabolism." (1906). Classic Article Collection. 207.