BMT, bone marrow transplantation; Eomes, Eomesodermin; GVHD, graft-versus-host disease; HCMV, human cytomegalovirus; HSCT, hematopoietic stem cell transplant; NK, Natural killer cell; PBMCs, peripheral blood mononuclear cells; T-bet, T-box transcription factor. Here, EOMES is linked to graft versus host disease.