Plasma dopamine β‐hydroxylase activity in a North Swedish isolate with a high frequency of schizophrenia

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Abstract
Plasma dopamine beta-hydroxylase (DBH) activity was determined in 115 members of a North Swedish geographical isolate with a high frequency of schizophrenia, of which 30 persons had schizophrenia, and was compared with a Middle Swedish population of 185 apparently healthy persons. There was no significant difference between the schizophrenic group and their healthy relatives or between the North and Middle-Swedish populations. The number of persons with very low plasma DBH activity in the North Swedish population appeared to be less than those in the control population.