Letter: Mechanism of action of antiiallergic drugs.
D015105:3',5'-Cyclic-AMP Phosphodiesterases; D004205:Cromolyn Sodium / Q000494:pharmacology; D006634:Histamine H1 Antagonists / Q000494:pharmacology*
D006634:Histamine H1 Antagonists; D015105:3',5'-Cyclic-AMP Phosphodiesterases; D004205:Cromolyn Sodium