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. 2016 Oct 4;6:34441. doi: 10.1038/srep34441

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Copyright © 2016, The Author(s)

This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/

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(a) X-ray crystallographic model of mono- nucleosome (PDB code 1KX5). Colors indicate different type of molecules: histone H3 is in red, histone H4 is in green, histone H2A is in blue, histone H2B is in orange, and DNA is in gray. Spheres represent lysine residues in N-terminal tails that can be acetylated and numbers in the spheres indicate residue numbers. Structural image is generated by VMD. (b) Cartoon image of tri-nucleosome. We call the first, the second, and the third nucleosomes as N1, N2, and N3, while the first and the second linker DNAs are called L12 and L23, respectively. Two copies of each histone are labeled by the subscript 1 and 2.