Control of established GVHD by DZNep. (A) Diagram shows the experimental design. Lethally irradiated BALB/C recipients (8 Gy [800 rad]) were transplanted with B6 mice–derived TCD BM (5 × 106; n = 8) or with TCD BM + CD4+ TN cells (1 × 106). CD4+ T-cell recipients were treated with 12 doses of DZNep (n = 20) or vehicle (■; n = 10) from day 7 to day 29 after transplantation. (B) Tissues were collected on day 7 and day 60 after transplantation for histologic examination. Graphs (mean ± SD) show the histologic score of GVHD. (C) The survival and clinical signs were monitored over time.