In a double-blind-crossover-study, 10 patients with schizophrenia, 10 of their unaffected siblings and 9 healthy controls randomly received metabolic stressor and placebo. A significant HVA plasma elevation in response to stress was found in siblings whose response was intermediate to that of patients and controls. Only siblings additionally displayed an exaggerated 5HIAA response.

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http://dx.doi.org/10.1016/j.eurpsy.2007.01.1219DOI Listing

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