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Tumor-infiltrating lymphocytes (TIL) in LLA-TG-3 tumors. a, b Showing CD4+ T cells in LLA-TG-3 tumors (red staining); c, d showing CD8+ T cells in LLA-TG-3 tumors (red staining). Nuclei were stained using hematoxylin. Scale bar: 100 μm. a, c Low tumor burden; b, d high tumor burden
