Abstract
We have studied the phase diagram for chromatin within the framework of the two-angle model. We reveal the fine-structure of the excluded-volume borderline for spherical type nucleosomes and for cylindrical shape nucleosomes. Thus we where able to give a Ramachandran like diagram for the chromatin fiber. Furthermore, we examined how fluctuations in the distribution of the H1 histones or changes of the vertical distance between the in and outgoing DNA strand affect the chromatin fiber and its biophysical properties.
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