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.