LAGUNA DESIGN / SCIENCE PHOTO LIBRARY LAGUNA DESIGN / SCIENCE PHOTO LIBRARY
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 (green and pink) 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 H2A.Z, H2B, H3, and H4. Each set of two DNA loops around a histone core is known as a nucleosome.
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