The rhGM-CSF–specific DTH response is a predominant T-cell (CD3⁺) infiltrate with mixed CD4⁺and CD8⁺ lymphocytes. (A) Hematoxylin and eosin staining of the rhGM-CSF–induced dermal cellular infiltrate (30x). (B through F) Represents the immunohistochemical staining of the rhGM-CSF DTH site for patient CR4723. (B) CD3 (30x); (C) CD4 (30x); (D) CD8 (30x); (E) CD20 (40x); (F) CD1a (30x).