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DNA strand breaks in BAL cells. DNA strand breaks in BAL cells obtained from mice exposed to 0, 18, 54 or 162 μg of NanoTiO2 (A) or Printex 90 (B) or 0, 54, 162 or 486 μg of Indoor-R (C) or Indoor-NanoTiO2 (D). The statistical analysis for Printex 90 has been described previously [19]. *, **, ***: Statistically significant compared to control mice at the 0.5, 0.01 and 0.001 level, respectively.
