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Figure 3 Acetylcholine-induced increase in forearm blood flow (FBF) during saline (open circles) or NG-monomethyl-L-arginine (L-NMMA) (solid circles), in the absence (control) and presence of vitamin C in normohomocystinemic (N-HCY) and hyperhomocystinemic (H-HCY) normotensive subjects.