Granulocyte-derived TNFα promotes vascular and hematopoietic regeneration in the bone marrow Granulocyte-derived TNFα promotes vascular and hematopoietic regeneration in the bone marrow, Published online: 20 November 2017; doi:10.1038/nm.4448In the bone marrow, granulocyte-derived TNFα acts on endothelial cells to maintain the vasculature under steady-state conditions and to promote its regeneration after injury or transplantation.