Transmission electron micrographs showing the unusual nucleolar structures in Sertoli cells of ruminants, with varying numbers of vesicles and tubules; the upper panel illustrates such an organization in the domestic bull, Bos taurus. Lower panels show the unusual nucleolar structures present in human endothelium, where a similar system of convoluted tubules is detected during the secretory phase of the menstrual cycle.
Upper panel is Figure 140; Lower panels appeared in Tersakis (1965) J. Cell Biol. 27: 158-61, reprinted with permission as Figures 141-3, from Chapter 4 (Nucleus) of 'The Cell, 2nd Ed.' by Don W. Fawcett M.D. A PDF copy of the corresponding chapter is available on the ASCB's BioEDUCATE website.
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