Why is it important that post-translational modifications on histones can be added?

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All of the post translational modifications on histones promote the condensation of DNA to form chromatin

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All of the post translational modifications on histones promote the relaxation of DNA to allow it to unwind

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The epigenetic state of a region of DNA is largely fixed, but it needs to be able to change if needed

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The additional of post-translational modifications influences the epigenetic state of the DNA region

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