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Histone H3, and Histone H4. Approximately 147 base pairs of DNA wrap around this histone octamer to form the nucleosome core particle.Neighboring nucleosomes are connected by stretches of linker DNA, which vary in length among organisms and cell types but typically range from about 20 to 60 base pairs. Arrays of nucleosomes connected by linker DNA form an extended fiber often described as a "beads-on-a-string" structure approximately 10-11

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