NKG2D-dependent infiltration of CD8+T cells into tumors. Tumors were collected from mice that had received one of the four standard treatments: control DNA, Dox plus control DNA, IL-12, Dox plus IL-12 (n = 3 per treatment group). (A) Infiltration of NKG2D-positive cells into tumors. Northern blot analysis was performed to detect NKG2D expression in tumors. Ribosomal RNA was used to confirm equal loading among samples. (B) NKG2D/CD8–positive cells in tumor sections by treatment received. Frozen tumor sections were stained with biotin anti-mouse NKG2D, anti-mouse CD8, or corresponding isotype control antibodies, then with streptavidin-conjugated Alexa fluor 594 or Alexa fluor 488 secondary antibodies. Data shown are representative of three independent experiments. The scale bar is equivalent to 100 μm.