title: H2-receptor antagonists and delayed hypersensitivity.
mesh_terms: D002927:Cimetidine / Q000276:immunology*; D006146:Guanidines / Q000276:immunology*; D006801:Humans; D006968:Hypersensitivity, Delayed / Q000139:chemically induced*; D011968:Receptors, Histamine; D011970:Receptors, Histamine H2; D012867:Skin / Q000276:immunology
chemical_list: D006146:Guanidines; D011968:Receptors, Histamine; D011970:Receptors, Histamine H2; D002927:Cimetidine