title: Apparent irrelevance of cyclic nucleotides to the relaxation of tracheal smooth muscle induced by theophylline.
mesh_terms: D000818:Animals; D002118:Calcium / Q000378:metabolism*; D000242:Cyclic AMP / Q000378:metabolism*; D006152:Cyclic GMP / Q000378:metabolism*; D004285:Dogs; D006168:Guinea Pigs; D008297:Male; D009119:Muscle Contraction / Q000187:drug effects*; D009126:Muscle Relaxation / Q000187:drug effects*; D009130:Muscle, Smooth / Q000187:drug effects* / Q000502:physiology; D013806:Theophylline / Q000494:pharmacology*; D014132:Trachea / Q000187:drug effects*
chemical_list: D013806:Theophylline; D000242:Cyclic AMP; D006152:Cyclic GMP; D002118:Calcium