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[google.com](https://www.google.com/search?q=shipped)Methylation been discovered on a spread of lysine residues in numerous histones: K4 (using the single-letter amino-acid code for lysine), K9, K27, K36 and K79 in histone H3, [law firm](http://git.kangcer.com/trishahargreav) K20 in histone H4, K59 in the globular domain of histone H4 2 and K26 of histone H1B 3 Several proteins liable for the methylation of particular residues have been characterized, and all however one among these incorporates a SET domain |