German: Methylierung
Japanese: メチル化

1. Chemistry. Introduction of the methyl group -CH3 into a chemical compound.

2. Molecular genetics. Modification of DNA that can be inherited without changing the DNA sequence. It is a well studied epigenetic mechanism. DNA methylation involves the addition of a methyl group to the nuclein base cytosine. It plays a role in regulating gene expression by blocking transcription.

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