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Trophoblast
The outer layer of a blastocyst, providing nutrients to the embryo and developing into a large part of the placenta.
Placenta
An organ that develops in the uterus during pregnancy to provide oxygen and nutrients to the growing baby, while removing waste products.
Primitive Streak
The primitive streak is a structure that forms on the surface of the early embryonic disc, marking the beginning of gastrulation and establishing body axes.
Embryonic Disc
A flat plate of cells in early embryonic development that will form the embryo.
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