Long-term exposure of the rats to 2 ppm F did not lead to
statistically significant increase in the number of DHR-123-
positive erythrocytes. However, considerable dose-dependent
generation of peroxides was observed in the blood of rats
received 10 and 20 ppm F (Table 2). In contrast, ·O2
− production
in erythrocytes of all three groups of F-intoxicated rats
was not altered as compared with control.