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Numbers of cytotoxic T-cells (CD3+ CD8+) and CD4+ T-cells, and median intensity of CD25 receptor expression on CD4+ T-cells in bronchoalveolar lavage fluid from nanosized TiO2 (5 mg/kg) exposed rats 0 (n = 5), 1 (n = 7), 2 (n = 7), 8 (n = 10), 16 (n = 5), 30 (n = 5), and 90 (n = 4) days after a single intratracheal instillation. Kruskal–Wallis test with Dunn's post-test; value is significantly (*P < 0.05, **P < 0.01, ***P < 0.001) different vs. control.
