(41)  GVHD  Umbilical cord blood  Prevention study for GVHDTreatment study for GVHD  Mice  ↑Survival rates↓Weight loss↓Clinical score↓Kidney, lungs, liver and gut pathology Multiple MSCs administrations > single MSCs administration at day 0.  ↑PGE2↑TGF-β1↓IFN-γ