Fig. 2.

Plots of the diameter and length of the reconstituted and folded 601-nucleosome arrays shown in Fig. 1. (A) Relationship between fiber diameter and linker length. The average diameter dimensions shown are calculated from 150–300 measurements of negatively stained (open squares) and frozen hydrated (filled square) chromatin arrays folded in 1.6 mM MgCl₂. Average diameters of TMV (open circles) and the 56 × 237-bp 601 array reconstituted with linker histone H1 purified from sea urchin sperm (filled triangle) are also included. (B) Relationship between the number of nucleosomes and chromatin fiber length. The average length dimensions shown are calculated from 70 to 100 measurements of negatively stained (open squares) and frozen hydrated (filled square) chromatin arrays folded in 1.6 mM MgCl₂.