Methylation been found on a range of lysine residues in various histones: K4 (using the only-letter amino-acid code for lysine), K9, K27, K36 and legal practice K79 in histone H3, nvkids.cse.solutions 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 characterised, and all however one among these incorporates a SET area