histones

https://doi.org/10.1351/goldbook.H02829
A class of basic @P04898@ associated with DNA in the @C01077@ of eukaryotic cells forming the nucleosome as the basic subunit of chromatin. They contain an unusually large proportion of the basic amino acids arginine and lysine.
Source:
PAC, 1992, 64, 143. (Glossary for chemists of terms used in biotechnology (IUPAC Recommendations 1992)) on page 156 [Terms] [Paper]