Fig. 13. Very high power TEM of the cortical area next to the fertilization cone of a stage 1a embryo in vitro, three hours after insemination (original magnification x27,300). Notice some of the released products are still attached to the cell membrane of the embryo (arrowheads).
SS, subzonal space.
(From: Sathananthan and Trounson, 1982. Reproduced with permission of the publisher, John Wiley & Sons.)
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