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Concentration-response curves for acetylcholine in the guinea-pig mesenteric artery (MA) and middle cerebral artery (CA) in the presence of a combination of NG-nitro-L-arginine (100 μ) plus indomethacin (10 μM) as a control and vessels pretreated with BaCl2 (30 μM), ouabain (100 μM) or their combination. Data are shown as the mean±s.e.mean from 8–10 separate experiments.
