. Cytology. Cytology. !>;»--'""" "'**fe*/ Figure 4-10. Electron Micrograph of Nucleolus in Tissue Culture Fibro- blast Cell. The filamentous and granular character of the nucleolus is clearly evident. In the center of the nucleolus is a more homogeneous area corre- sponding to the "pars amorpha." The double-layered nuclear membrane is shown indented at the top of the figure. (Courtesy of Dr. Frangoise Hague- nau. College de France, Paris.) constriction is involved, the nucleolar zone may exhibit a morphology distinct from that usually shown by other secondary c

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