Negative costimulatory molecule B7-H4 mediates protective effect of mesenchymal stem cells on experimental autoimmune encephalomyelitis oleh Xiao-Pei Ji, Yan-Zheng Gu, Hao Li, Zhou Yin, Nagam Varshithreddy, Ling-Tao Tang, Nan Li, Ying Zhang, Ming-Yuan Wang, Qin Shi, Si-Wei You, Xi-Ying Luan, Wan-Li Dong, Qi Fang, Xue-Guang Zhang, Qun Xue