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- W2048799557 abstract "Mild nuclease digestion of rat liver chromatin generates particles with sedimentation coefficients of about 33S, 60S, and 90S (in 50 mM NaCl). The kinetics of appearance and disappearance of these particles with progressive digestion suggest that they are produced by cleavage from a higher order repeat structure, the 33S particle representing the monomer. At an intermediate stage of digestion, about 75 % of the nuclear chromatin can be recovered as monomers to trimers of this higher order structure. Sedimentation profiles indicate that monomer particles containing 7–8 nucleosomes occur at the highest frequency. The DNA fragments in monomers have a size corresponding to hepta- and octanucleosomes, and those in dimers have a size corresponding to chains of sixteen nucleosomes. The higher order repeat structure is only stable between 30 and 200 mM NaCl; the particles unfold below 30 and above 200 mM NaCl. When examined by electron microscopy, monomers and dimers appear as compact globular structures. Relaxation by lowering the salt concentration results in the appearance of polynucleosomes with a chain length of eight beads in the monomer and sixteen in the dimer particle. These results indicate that the unit particle of the higher order repeat structure of rat liver chromatin contains eight nucleosomes." @default.
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- W2048799557 title "The higher order repeat structure of chromatin is built up of globular particles containing eight nucleosomes" @default.
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- W2048799557 doi "https://doi.org/10.1016/0014-4827(78)90144-1" @default.
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