Fig. 11. High power TEM of the same contact area of the stage 4 embryo in vitro shown in Figure 10. Measuring bar = 600 nm. See arrowhead in Figure 10. Notice apical junctional complex and desmosomes between penetrating trophoblast cell (T) and cultured endometrial epithelial cells (E). The apical plasma membrane of E is not in contact with T. No cytoplasmic specializations are present in E where there is contact. (From: Bentin-Ley et al., 2000. Reproduced with permission of the Society for Reproduction and Fertility.)