it was shown that about 80 % of lysine residues in nucleosomal histones and 100 % of the same residues in histone complexes without dna in 2 m nacl are accessible to the modification , which is proved by the localization of the majority of lysine residues in nucleosomes near the surface of the histone octamer , by their participation in ionic interactions with dna and , probably , in histone-histone contacts .
C0028623
nucleosomes
C0019652
histone