Purinergic nerves.
D000255:Adenosine Triphosphate / Q000502:physiology*; D000320:Adrenergic Fibers / Q000502:physiology*; D006801:Humans; D007422:Intestines / Q000294:innervation*; D009130:Muscle, Smooth / Q000294:innervation*; D018377:Neurotransmitter Agents
D018377:Neurotransmitter Agents; D000255:Adenosine Triphosphate