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Fiber geometry as a function of nucleosome repeat length (NRL). Average fiber diameter (left) and nucleosome packing density (right) obtained from compacted nucleosomal arrays using EM or X-ray scattering techniques are plotted against their respective NRL. Approximation of NRLs from various eukaryotes and cell-types obtained from endogenous chromatin samples (van Holde, 1989) are indicated by dashed lines.
