Abstract
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Heritability of schizophenic disorders is well known since Emil Kraepelin and well established by family- and twin studies. Progress in development of methods in molecular genetics have made it possible today to search for causes of a disease even if little is known about the pathophysiology of the illness. The intention of this review is to give a short introduction into the scientific foundations of this work as well as to stress preliminary results of the worldwide search for genetic causes of schizophrenia.