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Figure 1 Effects of three days nitroglycerin (NTG) treatment on acetylcholine (ACh) (A) and NTG concentration-response curve (B). Data are expressed as mean ± SEM of 8 to 10 experiments. *p < 0.05 versus control, {dagger}p < 0.05 versus WHHL. Black circles = control; black triangles = control + NTG; open circles = WHHL; open triangles = WHHL + NTG. WHHL = Watanabe heritable hyperlipidemic rabbits.