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What are nucleosomes ? What are they mad...

What are nucleosomes ? What are they made of ?

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Chromatin appears as beads on string. The beads are known as nucleosomes. Typical nucleosome contains 200 bp of DNA double helix wrapped (two turns) around a core of histone octamer having two copies of each of four types of histone proteins viz HZA, H2B, H3 and H4.
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