faqtoids.comMethylation been found on a variety of lysine residues in various histones: K4 (using the only-letter amino-acid code for lysine), K9, K27, K36 and K79 in histone H3, K20 in histone H4, legal practice K59 in the globular area of histone H4 2 and K26 of histone H1B 3 Several proteins accountable for the methylation of specific residues have been characterized, and all but considered one of these comprises a SET domain