Fig. 3

Comparison of MNed cell frequencies between the two methods A and between storage periods B. Each bar represents the frequency of MNed cells in the glandular stomach and colon (mean ± SD). N, negative control group; T, treatment group (combination treatment with DEN, DMH, and KBrO₃). Statistical significance: ns, not significant (Student’s t-test); *P < 0.01 (Kastenbaum and Bowman’s method), significant difference from the corresponding negative controls