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Quantitative histopathology of the NTE after treatment of rats with FA+CO, FA + 50 mg 1-NN/kg (FA+1-NN), ozone + CO (O3+CO), or ozone + 50 mg 1-NN/kg (O3+1-NN) at 6 hours after CO or 1-NN treatment. Data from 6- and 24-hour time points were not significantly different among the rats with the same treatment. *Significantly different from FA+CO; †O3+1-NN is significantly different from FA+1-NN; ‡O3+1-NN is significantly different from O3+CO. Significance was determined at P < 0.05.
