Mesenchymal stromal cells (MSCs) are rare precursors in all organs of the body. MSCs have profound anti-inflammatory effects and reduce alloreactivity in vitro and in vivo. In pediatric allogeneic hematopoietic cell transplantation (HCT). MSCs have mainly been used to treat acute graft-versus-host disease (GVHD). https://www.socialstudiesscholar.com/