Histologic findings. Organs were collected at different times after BMT and tissue sections were stained with hematoxylin and eosin. Original magnifications for spleen (left) and liver (right) are ×40 and ×100, respectively. (A) B6 mice receiving FVB BM plus EpTK T cells. (B) Control group receiving BM only.

(C) B6 mice receiving FVB BM plus EpΔTK T cells and treated with GCV. (D) B6 mice receiving FVB BM plus EpΔTK T cells, treated with GCV, and developing a late onset GVHD (day 54).