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Role of the endothelium in the vasodilator actions of α, β methylene ATP. The figure shows responses of vessels prepared either with (+EC) or without (−EC) an intact endothelium to α, β methylene ATP (10−4 M). Data are mean±s.e.m. for n=3 experiments. Statistical significance was established by Student's t-test, where a P-value of <0.05 was taken as significant and is illustrated by *.
