Fig. 28. TEM of a stage 2, 3-cell embryo in vitro, 44 hours post-insemination. All of the blastomeres have nuclei but the cut is through only one with a nucleolus. Clear vacuoles have increased in number and polar body 1 is in the subzonal space.
(From: Sathananthan, Trounson, and Wood, 1986. Reproduced with permission of the publisher, Greenwood Publishing Group.)
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