Zhao, H.F., Li, Q., Pei, X.R., Zhang, Z.F., Yang, R.Y., Wang, J.B. and Li, Y. (2009) Long-Term Ginsenoside Administration Prevents Memory Impairment in Aged C57BL/6J Mice by Up-Regulating the Synaptic Plasticity-Related Proteins in Hippocampus. Behavioural Brain Research, 201, 311-317.