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Implantation site in cleared celloidin block

View of the implantation site, as seen in the cleared celloidin block. The irregular, dark ring is caused by maternal blood within the trophoblast lacunae, and is a characteristic feature of subdivision 5c, as it has been defined by Hertig, Rock, and Adams.

Fig. 12. O'Rahilly and Müller, 1987.

Keywords: implantation site, trophoblast lacunae

Source: The Virtual Human Embryo.