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Locations of histone post-translational modifications that may alter histone–DNA interactions (A) and histone dimer–dimer interactions (B). In A, all histones are shown in a space-filling form. In B, the histone H3/H4 tetramer is shown in ribbon form and histones H2A/H2B are shown in a space-filling form and H2A/H2B have been made semi-transparent to reveal the amino acids on H4 that are at the interface between the H2A/H2B dimers and H3/H4 tetramer.
