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1. The nature of the adrenoceptors mediating the inhibitory action of noradrenaline, ritodrine and salbutamol on the spontaneous activity of longitudinal muscle of the rabbit jejunum in vitro was investigated by use of a range of adrenoceptor antagonists. 2. The actions of ritodrine and salbutamol were antagonized competitively by propranolol. The pA2(More)
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