Protective effect of tenuigenin on cytotoxicity of primary cultures of cortical neurons induced by amyloid beta-protein 1-40(Aβ1-40) Study of catalpol promoting axonal growth for cultured cortical neurons from rats Expression of NR1 mRNA of NMDA receptor by Gastrodine on hypoxia injury in cultured rat cerebral cortical neurons Protective Effects of Polysaccharide fromHolothuria atra on Apoptosis of Cortical Neurons Induced by Amyloid β-Protein