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The experimental protocol. After fixation of TCD probes, basal flow velocity was recorded. Visually evoked flow tests were performed before and after intravenous administration of 15 mg/kg AZ. The second visually evoked flow test was started 10 mins after AZ injection, at the maximal vasodilatory effect of AZ. The subjects' eyes were closed during the whole experiment except for the visual stimulation periods of the visually evoked flow tests.
