This text offers a comprehensive introduction to molecular biology, genetics, and neurobiology relevant to psychiatry. Generously illustrated chapters are organized to be read at both an introductory and a more advanced level. Both beginners and advanced professionals will benefit from this text"s discussion of how psychotropic drugs work and how gene-environment interactions may contribute to the pathogenesis of psychiatric disorders. The authors demonstrate how molecular investigations in psychiatry will revolutionize the field by leading to improved diagnostic testing, to new and more effective treatments, and ultimately to the development of preventive measures for mental illness.