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Effects of endothelium removal (A), endothelium removal plus L-nitro-arginine (100 μM) (A), propranolol (0.1 μM) (B) and atropine (10 nM) (B) on the nicotine-induced vasodilation in rat perfused mesenteric vascular beds with active tone. Each point represents mean±s.e.mean from 5–9 experiments. **P<0.01, compared with control.
