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therefore, its structure has been extensively studied and elucidated to achieve a better understanding of its functions (Webb and Lynch 2007

(2) SAM's Methyl Donor Function and Methylation Reactions As a universal methyl donor, SAM participates in diverse methylation reactions mediated by methyltransferases, transferring its methyl group to substrates like DNA, RNA, and proteins

doi: 10.1016/j.jhazmat.2021.125814 378 XuH.ChenY.HuangH.LiuY.YangZ