jvsenvironmental.netMethylation been discovered on a variety of lysine residues in numerous histones: K4 (using the only-letter amino-acid code for lysine), lawyer article K9, K27, K36 and K79 in histone H3, K20 in histone H4, K59 within the globular domain of histone H4 2 and K26 of histone H1B three A number of proteins responsible for the methylation of specific residues have been characterized, and all but considered one of these contains a SET area