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Reduction in tumor-infiltrating leukocytes in footpad tumors arising from CCR7-B16-injected mice. Single cell suspension of footpad tumors was prepared as described in Materials and Methods. Indicated are percentage of CD45+ cells in total tumor cells and percentage of CD45-expressing CD4+, CD8+, GR1+, and B220+ cells among the total tumor cells. This figure depicts one of four experiments with similar results. **, P < 0.01; ***, P< 0.001.
