True-to-scale DNA-density maps correlate with major accessibility differences between active and inactive chromatin oleh Márton Gelléri, Shih-Ya Chen, Barbara Hübner, Jan Neumann, Ole Kröger, Filip Sadlo, Jorg Imhoff, Michael J. Hendzel, Marion Cremer, Thomas Cremer, Hilmar Strickfaden, Christoph Cremer