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Tumors of mice treated with soluble CD80 (CD80-Fc) contain large areas of tumor-infiltrating CD3+ T cells. Tumors were excised on day 40 (Isotype control group) or 42 (all other groups) post-CT26 inoculation, embedded and frozen in O.C.T, and subsequently sectioned and stained for immunohistochemistry with mAbs to CD3. Magnification is ×200
