Fig. 38. High power TEM of the subzonal space of a stage 2, 8-cell embryo in vitro 72 hours post-insemination (original magnification x19,600). One cortical granule (arrowhead) is interacting wiht the zona pellucida (ZP) which has dense bands.
(From: Sathananthan and Trounson, 1982. Reproduced with permission of the publisher, John Wiley & Sons.)
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