Graft-versus-host disease (GVHD) can be a life-threatening complication of bone marrow transplantation (BMT). Understanding the mechanisms causing GVHD is important to developing treatments or preventive therapies. In this issue, Koyama et al. report the surprising finding that recipient nonhematopoietic antigen-presenting cells, rather than dendritic cells, are the crucial factor in inducing CD4+ T cell–dependent GVHD and death in mice.
- Motoko Koyama
- Rachel D Kuns
- Geoffrey R Hill
