Research Center for the Mathematics on Chromatin Live Dynamics (RcMcD), Hiroshima University, Higashi-Hiroshima, Japan.|Biological Macromolecules Laboratory, Structural Biology Center, National Institute of Genetics, Mishima, Japan.|Biological Macromolecules Laboratory, Structural Biology Center, National Institute of Genetics, Mishima, Japan.|Research Center for the Mathematics on Chromatin Live Dynamics (RcMcD), Hiroshima University, Higashi-Hiroshima, Japan.