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Vasodilator responses to brachial artery infusion of the endothelium dependent vasodilator serotonin in six healthy young subjects, during co-infusion of either l-NMMA (▴) or noradrenaline (▪). Data are mean±s.e.mean, and are changes compared with baseline FBF following 30 min saline infusion. Maximal forearm blood flow responses to serotonin were blunted during l-NMMA compared with noradrenaline co-infusion (P < 0.05).
