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Science 30 September 1966:
Vol. 153. no. 3744, pp. 1642 - 1644
DOI: 10.1126/science.153.3744.1642
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Articles

Circadian Rhythm for Tryptophan Pyrrolase Activit and Its Circulating Substrate

Morton I. Rapoport 1, Ralph D. Feigin 1, Joseph Bruton 1, and William R. Beisel 1

1 U.S. Army Medical Unit, Walter Reed Army Medical Center, Fort Detrick, Maryland

Hepatic tryptophan pyrrolase and its circulating substrate, whole blood tryptophan, have a circadian rhythmicity in mice. Intact adrenocortical function is required for the normal rhythmicity of both enzyme and substrate although an altered but less apparent rhythm persists in the adrenalectomized state.


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Science. ISSN 0036-8075 (print), 1095-9203 (online)