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The histology of human skin grafts harvested from mice between days 16 and 21 after i.p. injection of whole PBMCs (A), B cell-depleted PBMCs (B), saline (C), or CD8 T cell-depleted PBMCs (D). The specimens are stained with H&E. Magnification: A to D, ×70; insets, ×200.
