Methylation been found on a spread of lysine residues in various histones: K4 (using the single-letter amino-acid code for lysine), K9, K27, K36 and lawyers K79 in histone H3, solicitor law firms K20 in histone H4, K59 within the globular domain of histone H4 2 and K26 of histone H1B three A number of proteins liable for the methylation of particular residues have been characterized, and all however one of these incorporates a SET domain