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Figure 2 Time course of platelet-derived nitric oxide (PDNO) in subjects who quit smoking (group A, open bars) and subjects who resumed smoking (group B, solid bars). Note that PDNO was time-dependently increased after smoking cessation; however, in the subjects who resumed smoking, PDNO returned to the baseline values by resmoking. *p < 0.01 vs. day 0 in group A;  p < 0.05 vs. day 0 in group B;  p < 0.05 vs. day 14 in group B.
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