Inhibitory  -adrenoceptors in guinea-pig vas deferens.
D000818:Animals; D006168:Guinea Pigs; D066298:In Vitro Techniques; D008297:Male; D008688:Methacholine Compounds / Q000037:antagonists & inhibitors / Q000494:pharmacology*; D009638:Norepinephrine / Q000037:antagonists & inhibitors / Q000494:pharmacology*; D010646:Phentolamine / Q000494:pharmacology; D011433:Propranolol / Q000494:pharmacology; D011941:Receptors, Adrenergic; D011955:Receptors, Drug; D014649:Vas Deferens / Q000187:drug effects*
D008688:Methacholine Compounds; D011941:Receptors, Adrenergic; D011955:Receptors, Drug; D011433:Propranolol; D009638:Norepinephrine; D010646:Phentolamine