KENNETH EWARD / BIOGRAFX / SCIENCE PHOTO LIBRARY KENNETH EWARD / BIOGRAFX / SCIENCE PHOTO LIBRARY
Digital model of a nucleosome, the fundamental structural unit of chromosomes in the eukaryotic cell nucleus, drawn according to x-ray crystallography data. Cells store their chromosomal DNA as chromatin, a compact, well-organized arrangement of tiny bundles known as nucleosomes. Each nucleosome consists of a core group of histone proteins (burgundy) wrapped in chromosomal DNA (violet).
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