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Answer: They are the trophoblast cells that lie in contact with the inner cell mass (embryonal knob) of the blastocyst.

In the human blastocyst the outer layer of cells is the trophoblast. The trophoblast cells directly overlying the inner cell mass are called the cells of Rauber. They help the blastocyst attach to the endometrium during implantation; the rest of the trophoblast forms the chorion and the foetal part of the placenta.

Doubtly AI · 29 Oct 2026 AI-verified · Nov 2026 Report
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