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Immunohistochemistry of TUNEL, an apoptotic cell marker, in brains treated with rAAV2/GFP (A, B) or rAAV2/IL12 (C, D), accompanied with tumor implantation. On the last day of week-3 post tumor implantation, brain sections were harvested from two rAAV2/GFP-treated rats (A, B) and two rAAV2/IL12-treated rats (C, D). Apoptotic cells stained with TUNEL show dark brown. The scale bar indicates 100 μm (low power field).
