Table 1: Dosing scheme for NDEA and CCl4.

Doses
Control Group 1 Group 2 Group 3
Week 1 - NDEA NDEA NDEA
Week 2 - CCl4 - CCl4 5
Week 3 - CCl4 NDEA NDEA
Week 4 - CCl4 - CCl4 5
Week 5 - CCl4 NDEA NDEA
Week 6 - CCl4 - CCl4 5
Week 7 - CCl4 - -