General Principles of Receptor Binding.- Central Nervous System Dopamine Receptors.- Adrenergic Receptors.- Serotonin Receptors.- Tryptamine and Phenylethylamine Recognition Sites in Brain.- Muscarinic Cholinergic Receptors.- Excitatory Amino Acid Receptors.- GABA Receptor Binding.- Receptors for Nonopioid Neuropeptides.- Multiple Opioid Receptors in the Central Nervous System.- Purinergic Receptors in the CNS.- The Benzodiazepine Receptor.- Binding Sites for Antidepressants.- Phencyclidine (PCP) and Amphetamine Receptor Binding Sites.- Receptor Binding in Drug Discovery and Development.