Abstract
The small angle neutron scattering radii of gyration of 185 base pair subunits have been determined in H 2O and D 2O These values suggest that the outer diameter is 120 to 150Å. The results are not consistent with models in which all of the DNA is in an external shell. The neutron scattering profiles are in good agreement with a model based upon freeze etching electron microscopy (4) having two concentric coils of DNA with 80Åand 150Åexternal diameters.
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