Amino Acid Neurotransmitter found in majority of fast acting directed synapses in CNS Glutamate GABA gamma aminobutyric acid Acetylcholine Synthesis Monoamines Order of Synthesis Tyrosine tyrosine hydroxylase L dopa DOPA decarboxylase Dopamine dopamine hydroxylase Norepinephrine Epinephrine phenylethanolamine Nmethyl transferase Serotonin Synthesis Tryptophan Tryptophan hydroxylase 5 hydroxytryptophan 5 HTP 5 HTP decarboxylase 5 hydroxytryptamine 5 HT or Serotonin Monoamine Oxidase MAO Two forms MAO A and MAO B Norepinephrine and epinephrine Serotonin Dopamine Synaptic Events mechanisms Example of Agonists Cocaine Nicotine L Dopa Example of Antagonists Botulinum toxin Curare Atropine