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Erythrocyte catechol‐O‐methyltransferase activity in psychotic twins

Erythrocyte catechol‐O‐methyltransferase (COMT) activity was analyzed in 20 twin pairs, 6 monozygotic and 14 dizygotic, where one or both twins showed psychotic or prepsychotic symptoms. Fifteen of these pairs, 4 monozygotic and 11 dizygotic, were diagnosed as discordant for serious mental disturbance. The different psychotic states within twins did not seem to be associated with any difference in COMT activity.