DNA nucleosome, molecular model

DNA nucleosome, molecular model

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Credit: LAGUNA DESIGN/SCIENCE PHOTO LIBRARY

Caption: DNA nucleosome, molecular model. A nucleosome is a complex of DNA (deoxyribonucleic acid, light blue and brown) and proteins called histones (all other colours). 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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