Nuclear pores are clearly seen in these transmission electron micrographs of cells after cryo-fixation, freeze-fracture and surface replication. Upper panel shows the outer surface of of the nuclear envelope from a guinea pig Sertoli cell. Lower panel shows the inner surface of the nuclear envelope of of a rat pancreatic acinar cell. Upper micrograph from Fawcett and Chemes (1979) Tissue Cell 11:147-162, reprinted as Figure 148 with permission; lower micrograph courtesy of Bernard Gilula is Figure 149 from Chapter 4 (Nucleus) of 'The Cell, 2nd Ed.' by Don W. Fawcett M.D. A PDF copy of the chapter is available on the ASCB's BioEDUCATE website.
See: Fawcett and Chemes (1979) Tissue Cell 11:147-162.
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