Nucleosomes are the fundamental units of chromatin, comprising:
- Histone core: Eight histone proteins (H2A, H2B, H3, H4) around which DNA is wrapped.
- Core DNA: The 147 base pairs of DNA wrapped around the histone core.
| List I | List II |
|---|---|
| (A) Histone erasers | (III) Deacetylases |
| (B) Histone readers | (IV) Bromodomain proteins |
| (C) Histone writers | (I) Methyltransferase |
| (D) DNA unwinding | (II) Topoisomerase |

