Figure 5. The electrostatic interactions energies between lysine residues that can be acetylated and 5 DNA fragments for un-acetylated tri-nucleosome.

Lysine index are divided into three nucleosomes, each of which contains 28 lysine residues. The 28 lysine residues are further divided into two halves; each copy of H3, H4, H2A and H2B histones contain 14 lysine residues. Colors are used to distinguish lysine in different type of histones: H3 is in red, H4 is in green, H2A is in blue and H2B is in orange.