Diet, genotype, and serum metabolites. Data for this figure were compiled from previously published data.,, Only males are shown, but females behave similarly. (A) Bar graph of tHcy levels organized by diet and genotype. RD, regular diet; NAC, N-acetyl L-cysteine supplemented diet; MR, methionine-restricted diet; BSD, betaine-supplemented diet. Error bars show 95% CI. (B) Same as above, but serum methionine is shown instead. (C) Same as above, but serum tCys is shown.