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(A) Eukaryotic nucleosome consisting of DNA wrapped around a core of a (H3-H4)2 tetramer and two H2A-H2B dimers. Yellow, H2A; red, H2B; blue, H3; green, H4. (B) Archaeal histone homodimer of HMfB. HMfB, Histone B from Methanothermus fervidus.
