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Child probands with affective disorder identify families enriched with affective disorder (even compared with families of psychiatric controls), suggesting that juvenile- and adult-onset forms of this condition share the same diathesis. Rates of affective illness in the families of depressed youngsters also are notably higher than population-based estimates. The findings therefore indicate that very-early-onset affective disorder is familial and that pedigrees ascertained through affectively ill children are good candidates for family and genetic studies.

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