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Figure 3 Changes in blood pressure of recipient rats in response to circulating monocytes and platelets isolated from rats with myocardial infarction. See Methods for details. Cells were injected into control (circles, n = 5) and SR141716A -pretreated (6.45 µmol/kg IV; circles, n = 4) rats at 0 min. Basal mean arterial pressure (MAP) and heart rate were 116 ± 5 mm Hg and 402 ± 19 beats/min before and 114 ± 7 mm Hg and 383 ± 36 beats/min after SR141716A , respectively *Significant difference (p < 0.05) from corresponding control value.