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Chromatin is the combination of DNA and other proteins that make up the contents of the nucleus. The primary protein component of chromatin is histones which act to compactly package the DNA. Chromatin is only found in eukaryotic cells, prokaryotic cells have a very different organisation of their DNA which is not normally referred to as chromatin. The primary functions of chromatin are to package DNA into a smaller volume to fit in the cell, to strengthen the DNA to allow mitosis and meiosis and prevent DNA damage, and to control gene expression and DNA replication.
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