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Contraction (expressed as a percentage of contraction elicited by 90 mm KCl) of human internal mammary artery (a) and of human saphenous vein (b) induced by cumulative addition of increasing concentration of angiotensin II in the absence (vehicle: (•) or the presence of frusemide 10−6 m (○), 10−5 m (▴) or 10−4 m (▵) and 10−3 m (□). Values represent means of 8 to 11 experiments. The vertical bars are s.e.mean.
