in addition , high mobility was observed for side chain carbons of 45-50 % of all lysines ( delta and epsilon carbons ) and about 25 % of all arginines ( zeta carbon ) in histones ( including those in mobile segments ) , suggesting that basic residues in terminal histone sequences are not strongly involved in nucleosome structure and may instead help stabilize higher order chromatin structure .
C0019652
histone
C0028623
nucleosome