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Lebkowski, J. S., & Laemmli, U. K. (1982). Evidence for two levels of DNA folding in histone-depleted HeLa interphase nuclei. Journal of Molecular Biology, 156(2), 309–324. doi:10.1016/0022-2836(82)90331-x 
10.1016/0022-2836(82)90331-x