MRC1 and graft versus host disease: 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.