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Measurement of endothelial cell calcium events (A) and active cells (B) in pressurized mesenteric arteries. Addition of 20 μM 9-phenanthrol (9-PA) did not alter basal Ca2+ event frequency or the number of active cells, but blocked the ability of 0.3 μM ACh to stimulate events (n = 3). *, P < 0.05 vs. Basal.
