Fig. 33. Low power TEM of a section of a stage 2, 7-cell embryo in vivo, (original magnification x3,500). A round nucleus (N) is centrally located in one of the blastomeres (Bl) adjacent to the subzonal space (*).
ZP, zona pellucida.
(From: Pereda and Croxatto, 1992. Reproduced with permission of the Annals, Academy of Medicine, Singapore.)
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