The costo‐uterine muscle of the rat contains a homogeneous population of β‐adrenoceptors

1 The effects of two selective β‐adrenoceptor antagonists on the inhibitory responses to some sympathomimetic amines of electrically‐stimulated preparations of costo‐uterine muscle, taken from virgin rats, have been examined quantitatively. 2 pA2 values for the antagonist, atenolol (β1‐selective) an...

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