title: Peptidergic versus purinergic.
mesh_terms: D000255:Adenosine Triphosphate / Q000502:physiology; D000320:Adrenergic Fibers / Q000502:physiology; D006801:Humans; D009412:Nerve Fibers / Q000502:physiology*; D009476:Neurons, Efferent / Q000502:physiology*; D014660:Vasoactive Intestinal Peptide / Q000502:physiology
chemical_list: D014660:Vasoactive Intestinal Peptide; D000255:Adenosine Triphosphate