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Respective concentration-response relation and resultant percent vasorelaxation ([NS1619]= 30μM) of isolated perfused lungs from normoxic (a & b) and hypoxic (c & d) rats (n = 3–6/group) to the BKCa channel activator, NS1619, in the absence (vehicle) and presence of iberiotoxin (Ibtx; 200 nM; membrane BKCa channel inhibitor) and nifedipine (1 μM; L-type Ca2+ channel blocker). Values are means ± SE. *P < 0.05 vs. vehicle. #P < 0.05 vs. Ibtx
