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Comparison of the Treg/CD4+ levels in the spleen of tumor-free rats (open circles, n = 9) and tumor-bearing rats (filled circles, n = 8). FACScan analysis of splenocytes was performed 32 days after RG2 tumor implantation. Treg/CD4+ levels were found to be higher in tumor-bearing animals (19 ± 5) than in tumor-free animals (14 ± 4), (p = 0.07)
