Chromatin is the fibre-shaped form in which nuclear DNA exists when the a cell is not dividing. It consists of the nucleosome units wrapped into a superstructural fibre under the influence of histone H1; each turn of the fibre contains 6 nucleosomes.
Chromatin is further subdivided depending on whether the chromatin fibre is incorporated into a tertiary level of superstructure - a loop, as in heterochromatin - or whether it remains relatively loose within the nucleoplasm - euchromatin.
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