Fig. 57. TEM of a stage 2, 7-cell embryo in vivo (original magnification x7,500). Notice the beginning of internal differentiation of the nucleolus (Nl) with segregation of fibrillar and granular material (arrows).
M, mitochondrion; N, nucleus.
(From: Pereda and Croxatto, 1992. Reproduced with permission of the Annals, Academy of Medicine, Singapore.)
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