Fig. 60. Very high power TEM of an expanded stage 3 embryo in vitro showing details of mitochondria within a trophoblast cell (original magnification x35,000). Some mitochondria are smaller and are beginning to elongate as their inner membranes form transverse cristae; others are larger and spherical and retain peripheral arch-like cristae.
R, rough endoplasmic reticulum.
(From: Sathananthan and Trounson, 2000)
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