2 Arachidonoylglycerol 2 Arachidonyl Glyceryl Ether Acetylcholine Adenosine Adenosine Triphosphate Anandamide Aspartate Calcium Ion Carbon Monoxide Catecholamine Cholecystokinin Cyclic Amp D Serine Dag Dopamine Dynorphin Endorphin Enkephalin Epinephrine Gaba Glutamate Glycine Histamine Hydrogen Sulfide Ip3 N Arachidonoyl Dopamine N Methylphenethylamine N Methyltryptamine Neuropeptide Nicotinamide Adenine Dinucleotide Nitric Oxide Norepinephrine Octopamine Orexin Oxytocin Phenethylamine Second Messenger Serotonin Somatostatin Substance P Synephrine Tryptamine Tyramine Vasopressin Virodhamine