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Traces illustrating simultaneous measurements of force (upper traces) and changes in NO concentrations (lower traces) in (A) the rat superior mesenteric artery relaxed with ACh and (B) a small human artery relaxed with ACh and SNAP. In this artery oxyhaemoglobin (Oxyhbg) partly reversed the increase in NO concentration, with only a small change in force. NA, noradrenaline; W, wash out.
