Embryo 7700 - Stage 5c
Fig. 12. O'Rahilly and Müller, 1987.
View of the implantation site, as seen in the cleared celloidin block. The irregular, dark ring is caused by maternal blood within the trophoblastic lacunae, and is a characteristic feature of subdivision 5c, as it has been defined by Hertig, Rock, and Adams.
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