GSTA4 and neoplasm: The observations that C57BL/6.Psl1BH1dba mice were more sensitive than C57BL/6 mice (Table 2) and that C57BL/6.Psl1H6dba mice had a tumor response similar to C57BL/6 (Table 2) are consistent with the conclusion that Gsta4 is a tumor promotion susceptibility gene as recently reported (Abel et al. 2010).