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Kaplan - Meier survival analysis in ferrets injected with either sham or NNK with or without lycopene supplementation. **P<0.01 (Long rank test). Abbreviations: C+P: control (sham) + placebo group; C+LL: control + low-dose lycopene group; C+HL: control + high-dose lycopene group; N+P: NNK + placebo group; N+LL: NNK + low-dose lycopene group: N+HL: NNK + high-dose lycopene group.
