CSF3 and graft versus host disease: Wang et al. transplanted G-CSF-stimulated generated e-MDSCs into acute GVHD xenogeneic model mice and observed that these cells prevented the occurrence of GVHD and that e-MDSCs inhibited T cell proliferation in a TGF-β-dependent manner, modulated Th cell differentiation from Th1 to Th2 and promoted Treg production.