One of many building blocks of protein, lysine is equipped by many meals—notably purple meats, fish and dairy merchandise. Methylation been discovered on a range of lysine residues in numerous histones: K4 (utilizing the one-letter amino-acid code for lysine), K9, K27, K36 and K79 in histone H3, K20 in histone H4, lawyer in my area K59 within the globular domain of histone H4 2 and K26 of histone H1B 3 A number of proteins answerable for the methylation of particular residues have been characterized, and all but considered one of these accommodates a SET domain