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Define a non-histone protien and also its structure.

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Non-histone chromosomal proteins are additional set of proteins required for packaging of chromatin at higher level (chromatin fibres and chromosomes). For example - Protein A24.
Most of these are acidic in amino acid composition.

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In chromatin, those proteins which remain after the histones have been removed, are classified as non-histone proteins. Scaffold proteins, DNA polymerase, Heterochromatin Protein 1 and Polycomb are common non-histone proteins.

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