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Figure 3 Percent change from baseline in the forearm blood flow (FBF) ratio between the infused and noninfused arms during intra-arterial infusion of acetylcholine under co-infusion of saline, aminoguanidine or NG-monomethyl-L-arginine (L-NMMA) in five normal subjects. *p < 0.001 vs. corresponding saline value.