Effects of vehicle (open column), mibefradil (3 μM, striped filled column), nicardipine (0.1 μM, black filled column), and nickel (300 μM, filled column with parallel lines) on EJPs and the contractions to 50% KPSS (KPSS) or αβ-MeATP (1 μM) in rat mesenteric arteries. n=4–6. All values were expressed as the mean±1 s.e.mean. For each experiment, the n value was equal to the number of rats from which the arteries were obtained.