Fig. 4.
Electron micrographs of aberrant polymer formed with NSC 613241. Magnification is indicated by the bars in each panel. A and B. Lower magnification views. The dashed box in panel B indicates an area shown at higher magnification in panel C. C. Middle magnification view. D. Higher magnification view. Single arrows indicate areas with a 2 filament substructure. The double arrow indicates an area where there appears to be a 3 filament substructure, although this may be caused by overlapping spirals.