H2 receptors in airway smooth muscle.
D002927:Cimetidine / Q000494:pharmacology; D006801:Humans; D009130:Muscle, Smooth; D011968:Receptors, Histamine; D011970:Receptors, Histamine H2
D011968:Receptors, Histamine; D011970:Receptors, Histamine H2; D002927:Cimetidine