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The pros and cons of N-methyl-d-aspartate (NMDA) antagonists as drug models of schizophrenia are discussed in relation to the neuropathology of this complex mental spectrum of diseases. The role of acetylcholine, dopamine, gamma aminobutyric acid, glutamic acid, and serotonin emphasizes that multiple neurotransmitter system abnormalities are involved, even though current drug therapy involves primarily...