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Comparison of effects of i.v. injection of (a) tyramine and (b) noradrenaline on peak increases in mean systemic arterial pressure, the area under-the-curve of the pressor response, and the increase in heart rate in anesthetized Dbh +/− and Dbh −/− mice. Only increases in heart rate were analyzed. n Indicates number of experiments, * indicates P<0.05.
