Fig. 22. Very high power TEM of a basal tight junction (between arrowheads) in the appositional region of two trophoblast cells of a mid blastocyst, stage 3 embryo, 96-120 hours post-insemination (original magnification x146,000).
(From: Gualtieri, Santella, and Dale, 1992. Reproduced with permission of the publisher, John Wiley & Sons.)
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