4KHB:
reference: Structural basis of histone H2A-H2B recognition by the essential chaperone FACT., Hondele M, Stuwe T, Hassler M, Halbach F, Bowman A, Zhang ET, Nijmeijer B, Kotthoff C, Rybin V, Amlacher S, Hurt E, Ladurner AG, Nature. 2013 May 22. doi: 10.1038/nature12242. PMID: 23698368

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