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Effects of L-arginine, L-ascorbate and pyridoxine on relaxant responses to ACh (a–c) and to A23187 (d–f), in the absence of LDL. Responses are shown in the absence and in the presence of incremental concentrations of L-arginine (a and d), L-ascorbate (b and e) or pyridoxine (c and f). *P<0.05 as compared with control
