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Effect of Panax quinquefolium 20(S)-protopanaxadiol saponins (PQDS) on nitric oxide (NO) and nitric oxide synthase (NOS) in the serum. (A) The levels of NO and (B) activity of NOS were measured respectively following 24 h ischemia. Data are presented as the mean ± standard deviation. #P<0.05 compared with sham group, *P<0.05 compared with middle cerebral artery occlusion (MCAO) group.
