Effects of aging and ER on the mRNA levels of uptake transporters in mouse livers. Adult groups were 12 months of age, and aged groups were 24 months of age; C, control. Data are expressed as mean ± S.E. of five mice per group. *, statistically different from same-age control group; †, statistically different from adult mice on the same diet. p ≤ 0.05, one-way analysis of variance followed by Duncan's test. The same illustrations are applied to the following figures.