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Histological analysis of muscle and tumors after transfection. Photomicrographs of hematoxylin and eosin-stained sections of muscle (A and B) and tumor (C and D) taken with a 10× objective. (A) Muscle injected with PEI/DNA shows damaged myocytes with calcifications, indicated with arrows. (B) Muscle injected with C32/DNA shows no pathology. (C) Uninjected tumor control. (D) Tumor injected with C32/DNA shows no histological differences from control tumor.
