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Nifedipine inhibits CaL currents in arteriolar muscle cells. The data are given as the mean ± SE. (A) The mean current-value (I-V) relationship (n = 8) for CaL channel currents measured at the peak of test pulses in the absence (○), presence (•), and after washout of 1 μM nifedipine (⋄). (B) Raw current traces (top) from a single smooth muscle cell in the presence and absence of nifedipine during a depolarization from −70 mV to +20 mV (bottom).
