Although statistically significant effects were only seen at the 2 mg/kg b.w. dose during the course of our study, a ∼two and ∼threefold increase in 5-bromo-2'-deoxyuridine labeling index was observed at 0.1 and 0.5 mg/kg b.w., respectively, suggesting that chronic exposure to doses even below 2 mg/kg b.w. may cause proliferative changes in rat liver and highlighting the need to assess furan carcinogenicity at lower doses.
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