Saponins from Panax japonicus attenuate cognitive impairment in ageing rats through regulating microglial polarisation and autophagy oleh Xue-Jiao Pi, Qing-Qing Zhao, Jin-Xin Wang, Xu-Lan Zhang, Ding Yuan, Shan-Shan Hu, Yu-Min He, Chang-Cheng Zhang, Zhi-Yong Zhou, Ting Wang