Methylation been discovered on a range of lysine residues lawyers in my area various histones: K4 (utilizing the single-letter amino-acid code for lysine), 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 3 Several proteins answerable for the methylation of specific residues have been characterized, and all but one of these incorporates a SET area