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Transfusion associated graft-versus-host disease (TA-GVHD) Billingham1) suggested 3 conditions necessary for the development of GVHD: 1) the graft has immunocompetent cells; 2) the host has alloantigens those are absent in the graft; 3) the host lacks When these conditions are satisfied, the immune cells (T cells) of the donor in the graft can survive in the recipient. The donor cells are not