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Aim: Our previous study showed hypermethylation of dimethylarginine dimethylaminohydrolase 2 (DDAH2) contributes to homocysteine (Hcy)-induced apoptosis of endothelial cells (ECs).Epigallocatechin-3-gallate (EGCG) is a green tea-derived phenol which has beneficial on atherosclerosis.It was demonstrated that EGCG inhibits DNA methyltransferase (DNMT) activity and reactivate methylation-silenced genes in cancer cells.