Fig. 51. Very high power TEM of a section of a blastomere of a stage 2, 7-cell embryo in vivo (original magnification x40,000). The mitochondrion (M) has perpendicular cristae and is closely related to small vesicles (V) of the smooth endoplasmic reticulum.
(From: Pereda and Croxatto, 1992. Reproduced with permission of the Annals, Academy of Medicine, Singapore.)
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