Fig. 61. Very high TEM of part of a blastomere of a stage 2, 16-cell embryo in vivo (original magnification x42,000). A well-formed nucleolus (Nl) contains densely packed fibrils next to fibrillo-granular areas. Notice that blebs are absent in the nuclear membrane (arrows).
(From: Pereda and Croxatto, 1992. Reproduced with permission of the Annals, Academy of Medicine, Singapore.)
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