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 et al., 1992. Reproduced with permission of the publisher, John Wiley & Sons.
Keywords: basal tight junction, blastocyst(s), trophoblast cells
Source: The Virtual Human Embryo.