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Effects of ATP P2X receptor-desensitizing agent, α,β-methylene ATP (a; α,β-mATP) and adenosine receptor antagonist (b; 8-(p-sulfophenyl) theophylline; 8-SPT) and NPY Y1 receptor antagonist (c; BIBP3226) on nicotine-induced vasodilation in rat perfused mesenteric vascular beds without endothelium. *P<0.01, compared with control.
