Generation and large-scale expansion of human inducible regulatory T cells that suppress graft-versus-host disease. - Hippen KL; Merkel SC; Schirm DK; Nelson C; Tennis NC; Riley JL; June CH; Miller JS; Wagner JE; Blazar BR (American journal of transplantation : official journal of the American Society of Transplantation and the American Society of Transplant Surgeons, 2011)