Nucleosome

**Semantic type:** Amino Acid, Peptide, or Protein|Nucleic Acid, Nucleoside, or Nucleotide

**Definition:** A DNA packaging complex comprised of approximately 200 base pairs of DNA wound around a protein core, which is formed by an octomer of histones. The histone octomer includes two dimers of histones H2A and H2B that surround a tetramer consisting of two molecules of histone H3 and two molecules of histone H4.

**Synonyms:** - NUCLEOSOME