Fig. 50. High power TEM of a hatching stage 3 embryo in vitro showing the hatching point (original magnification x5,100). Notice the zona-breaker cells (ZBC) on either side of the opening (O) in the zona pellucida (ZP) and dark tonofilaments (arrow) in the bend of one of the cells.
BC, blastocystic cavity.
(From: Sathananthan, Menzes, and Gunasheela, 2003. Printed from Reproductive Biomedicine Online.)
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