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Behavioral genetics has now entered the molecular era, as indicated by the publication of high-profile reports on the influence of genes on neurotransmitter function and metabolism as well as on brain growth factors. Variations within populations in imaged brain function, and in the risks of major depression, obsessivecompulsive disorder, and bipolar affective disorder, have all been reported. A series of replicated reports on genetic variants in schizophrenia and alcohol dependence has given a new stimulus to work being done on neurobiologic mechanisms of disease.
The identification of specific genes influencing human behavior has profound implications. We would agree now, I
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