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Medical Unit, St. Mary's Hospital Medical School, Paddington, London W.2
A young woman achieved nitrogen balance when her tryptophan-free diet was supplemented with 0.5 g of 3-indolepyruvic acid daily. Nitrogen balance promptly became negative when the
-ketoacid was withdrawn.
KEY WORDS: tryptophan synthesis 3-indolepyruvic acid nitrogen balance woman
Manuscript received 27 January 1972.