Similar to normal skin, the majority of HLA class II-expressing cells found in skin biopsies taken after MA alloSCT in the absence of GVHD appeared to be macrophages (HLA class II-positive cells were expressing CD68-and HLA class II-positive cells were expressing CD206) (Figure 4B) that did not harbor the phenotype of resident or inflammatory dermal DCs illustrated by the absence of CD11c expression. The gene discussed is CD68; the disease is graft versus host disease.