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Epithelial phase of implantation in human Epithelium (receptive phase)
Apposition (orientation)
Attachment
Trophoblast differentiation
Penetration by primary syncytium
Embryo‐epithelium interactions during implantation at a glance. Aplin JD, Ruane PT. J Cell Sci. 2017 Jan 1;130(1):15‐22. doi: 10.1242/jcs.175943. PMID: 28043966
There are at least three distinct trophoblast cell types at this stage
Embryo‐stroma interaction
Uterine lumen with a trace of fluid (black)
Parietal decidua
Conceptus (yolk sac)
image: courtesy of Jan Brosens
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