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Figure 2a. Representative power Doppler US images from (a) tumors in the control group, (b) tumors treated with TNF, (c) tumors treated with radiation therapy, and (d) tumors receiving combined TNF and radiation therapy. Depicted blood vessels are greatest in the periphery of the tumors (arrowheads in a). Treatment with radiation alone or TNF alone results in a decrease in depicted blood vessels. Combined therapy results in a greater decrease in depicted blood vessels.