Fig. 62. Very high power TEM of part of a blastomere of a stage 2, 4-cell embryo in vivo (original magnification x40,000). Shown is a nucleolus (Nl) with a very dense core and an irregular granular periphery (arrows).
(From: Pereda and Croxatto, 1992. Reproduced with permission of the Annals, Academy of Medicine, Singapore.)
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