DNA nucleosome, molecular model

DNA nucleosome, molecular model

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Credit: LAGUNA DESIGN/SCIENCE PHOTO LIBRARY

Caption: DNA nucleosome. Computer model based on X-ray diffraction data of the structure of a nucleosome. A nucleosome is a complex of DNA (deoxyribonucleic acid, red, orange and yellow) and proteins called histones (blue and green helices). The nucleosomes form "beads on a string" of DNA, which are coiled in turn to form a fibre of chromatin, the form in which DNA is stored inside cell nuclei. The structure of chromatin allows huge lengths of DNA to be stored in a very small volume. During DNA replication or the expression of genes in the DNA, the chromatin unwinds into a form that allows regulatory proteins and RNA complexes access to the genes.

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Keywords: biochemical, biochemistry, biological, biology, chemical, chromatin, coil, coiled, complex, deoxyribonucleic acid, dna, eukaryotic, expression, gene, genes, genetic, genetics, histone, histones, material, molecular, molecular model, molecule, multicoloured, nucleosome, package, packing, protein, secondary structure, storage, subunit, unit, x-ray diffraction, xray

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