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Groups of Wistar rats
| Group | Number | Dose of MNNG (mg/kg) | Dose of selenium in water (mg/L) | Time of selenium given |
| Normal control | 10 | 0 | 0 | / |
| Experimental control | 22 | 20 | 0 | / |
| Low selenium | 15 | 20 | 2 | 1 wk before MNNG gavage |
| High selenium | 15 | 20 | 4 | 1 wk before MNNG gavage |
