C4d IHC Results None Minimal Focal Diffuse Total Colon Cases* Patient Cases (clinical GVHD) 1 1 4 12 18   Normal Controls 10 2 0 0 12 Skin Cases Patient Cases (clinical GVHD) 13 17 9 1 40 *p-value <.0001, colon cases vs. controls

Table 1: C4d Immunohistochemistry (IHC) Results by Group.