title: The effect of theophylline and other methylxanthines on presynaptic inhibition of the longitudinal smooth muscle of the guinea pig ileum induced by purine nucleotides.
mesh_terms: D000818:Animals; D004558:Electric Stimulation; D006168:Guinea Pigs; D007082:Ileum / Q000294:innervation*; D066298:In Vitro Techniques; D008297:Male; D009119:Muscle Contraction / Q000187:drug effects; D009130:Muscle, Smooth / Q000502:physiology; D011685:Purine Nucleotides / Q000037:antagonists & inhibitors*; D017981:Receptors, Neurotransmitter / Q000187:drug effects*; D013329:Structure-Activity Relationship; D013806:Theophylline / Q000494:pharmacology*; D014970:Xanthines / Q000494:pharmacology*
chemical_list: D011685:Purine Nucleotides; D017981:Receptors, Neurotransmitter; D014970:Xanthines; D013806:Theophylline