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Mean ± SEM values for relaxation responses to acetylcholine in norepinephrine preconstricted mesenteric arterioles (panel A) and calculated EDRF (panel B) and EDHF (panel C) and EDCF responses in vessels under spontaneous tone (panel D). Comparing sham- and angiotensin-infused responses: *, P<0.05; **, P<0.01. There were no significant differences between sham- and angiotensin-infused responses in rats given tempol. B, before.
