Body and liver weights (grams) in Ames dwarf and wild-type mice following 8 weeks of 0.16%, 0.43%, or 1.3% dietary methionine consumption. Values in bar graphs represent means ± SEM. Asterisks represent significant genotype differences within diet. ****p < 0.0001 dwarf versus wild-type mice. Colored numbers above each bar represent average gain or loss of weight from the beginning to the end of the 8-week period.