Exosomes from Human-Induced Pluripotent Stem Cell-Derived Mesenchymal Stromal Cells (hiPSC-MSCs) Protect Liver against Hepatic Ischemia/ Reperfusion Injury via Activating Sphingosine Kinase and Sphingosine-1-Phosphate Signaling Pathway. - Du Y; Li D; Han C; Wu H; Xu L; Zhang M; Zhang J; Chen X (Cellular physiology and biochemistry : international journal of experimental cellular physiology, biochemistry, and pharmacology, 2017)