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The four histones H2A, H2B, H3 and H4 from calf thymus, CHO and sea urchin gastrula cells were associated by stepwise dialysis from 2 M NaCl with SV40 DNA Form I. The in vitro-assembled chromatins were visualized by electron microscopy and the size of the DNA fragments generated by digestion with DNase II was determined. Irrespective of the origin of the histones, the size of the smallest DNA band generated at early times of digestion was about 190 base pairs, whereas oligomeric DNA bands were multiples of 140 bp. These results support our previous proposal that the four histones H2A, H2B, H3 and H4 are able to organize more than 140 bp of DNA, but do not provide any evidence that the variability of histones H2A and H2B plays a role in the variability of the DNA repeat length of native chromatins.

The same amount of DNA is organized in in vitro-assembled nucleosomes irrespective of the origin of the histones