Fig. 49. High power TEM of a section of a blastomere of a stage 2, 4-cell embryo in vivo (original magnification x30,000). Small, flattened saccules (arrows) are closely related to dense mitochondria.
N, nucleus.
(From: Pereda and Croxatto, 1992. Reproduced with permission of the Annals, Academy of Medicine, Singapore.)
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