Embryo 7700 - Stage 5c | Fig. 12. O'Rahilly and Müller, 1987. |
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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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