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Determination of the effect of phentolamine on EFS-induced response. (a) Effect of EFS on vessel diameter in endothelium-denuded vessels; a significant effect was observed (n=11, P<0.01). (b) Effect of EFS on vessel diameter in endothelium-denuded vessels in the presence of 10− 5 M phentolamine; no effect was observed (n=6, P=0.60).
