Neuroprotective effects of serum with Tongqiao Huoxue decoction (TQHXD)against glutamate-induced neurotoxicity in PC12 cells Advanced achievements about neuroprotective mechanisms of paeoniflorin Chemical constituents from stems of Clausena emarginata Study on neuroprotective active constituents from root and rhizome of Valeriana amurensis Neuroprotective effects of Curcumin Neuroprotective effects of curcumin Research progress on macamides Caffeic acids from roots of Arctium lappa and their neuroprotective activity