Studies of the concordance rates for unipolar mood disorder and bipolar mood disorder in monozygotic (MZ) and dizygotic (DZ) twins suggest

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Studies have shown that the concordance rates for bipolar mood disorder are higher in MZ twins compared to DZ twins, which suggests a larger role of genetic factors in the development of bipolar mood disorder. In contrast, concordance rates for unipolar mood disorder do not show a significant difference between MZ and DZ twins, indicating a smaller role of genetic factors.

Studies of the Concordance Rates for Unipolar Mood Disorder and Bipolar