DNA Packaging
DNA is folded around histone proteins to create (a) nucleosome complexes. These nucleosomes control the access of proteins to the underlying DNA. When viewed through an electron microscope (b), the nucleosomes look like beads on a string.
Source
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"OpenStax College, Eukaryotic Epigenetic Gene Regulation. October 16, 2013."
http://cnx.org/content/m44536/latest/Figure_16_03_01ab.jpg
OpenStax CNX
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