Chromatin is the complex combination of DNA and proteins that makes up chromosomes.[1][2] It is found inside the nuclei of eukaryotic cells.
Chromatin is divided into heterochromatin (condensed) and euchromatin (extended) forms.[3][4] Heterochromatin is composed mostly of satellite DNA tandem repeats. The active components of chromatin are DNA and histone proteins, although other proteins also occur.[5] The functions of chromatin are: