Comments |
"Found in the chromatin of all eukaryotic cells, histones
have molecular weights between 11,000 and 21,000 and
are very rich in the basic amino acids arginine and lysine
(together these make up about one-fourth of the
amino acid residues). All eukaryotic cells have five major
classes of histones, differing in molecular weight and
amino acid composition (Table 24–3). The H3 histones
are nearly identical in amino acid sequence in all
eukaryotes, as are the H4 histones, suggesting strict
conservation of their functions." See note beneath table |