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1 From the Department of Pharmacology, State University of New York, Downstate Medical Center, Brooklyn
Relaxation of selected isolated arteries by acetylcholine, bradykinin, and certain other vasodilators is mediated by a factor released from endothelial cells. Relaxation by the factor (chemical identity still unknown) is accompanied by an increase of cyclic GMP. The finding that hemoglobin inhibits both endothelium-dependent relaxation and the increase in cyclic GMP may have pathophysiologic relevance.
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