Fig. 2.

Changes in hepatic levels of enzymes involved in sulfur amino acid metabolism with increasing age in mice by immunoblot analysis. Values are percentages of the hepatic level in 2-month-old mice. Each value represents the mean ± SD for five mice. Comparisons among the four different age groups were made using a one-way ANOVA followed by Newman-Keuls multiple range test. Values with different letters are significantly different from each other, p<0.05. MAT I/III, methionine adenosyltransferase I/III; SAHH, Sadenosylhomocysteine hydrolase; BHMT, betaine homocysteine methyltransferase; MS, methionine synthase; CβS, cystathionine β-synthase; GCLC, γ-glutamylcysteine ligase catalytic subunit; GCLM, γ-glutamylcysteine ligase modifier subunit; CDO, cysteine dioxygenase.