The effects of DHS, SNP, SNAP, and CO on the normalized Po of KCa channels in inside-out patches of vascular SMCs after anti-KCa,β antisense ODN treatment. Membrane potential, +30 mV. [Ca2+]i, 1 μM. n = 7 (from at least two batches of cells) for each group. *P < 0.01 vs. control.