DNA nucleosome. Molecular model of a nucleosome, the fundamental repeating unit used to package DNA (deoxyribonucleic acid) inside cell nuclei. DNA is
DNA nucleosome. Molecular model of a nucleosome, the fundamental repeating unit used to package DNA (deoxyribonucleic acid) inside cell nuclei. DNA is the molecule that carries the genetic code that forms the basis of all life on Earth. DNA's double helix structure (yellow and red) is seen here tightly coiled round a core of histone proteins (centre, multicoloured). The histone octomer consists of 2 copies each of the core histones , H2B, H3, and H4. Each set of two DNA loops around a histone core is known as a nucleosome.
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