Fig. 11. Results from statistical analysis of the areas occupied by various nucleolar substructural regions, rDNA fibers, as well as the regions occupied by Ag-NOR proteins. The area of the region occupied by the extended rDNA fibers is approximately one-third of the total DFC; the area of the region occupied by Ag-NOR proteins is approximately the same as that occupied by rDNA fibers. (a) Total area of nucleolus; (b) granular components; (c) fibrillar center; (d) dense fibrillar component; (e) rDNA fibers; (f) Ag-NOR proteins.