trophoblast [UBERON_0000088]
The mesectodermal cell layer arising from the trophectoderm that erodes the uterine mucosa and contributes to the formation of the placenta. Aggregate of cells forming the outer layer of a blastocyst, which provide nutrients to the embryo and develop into a large part of the placenta. They are formed during the first stage of pregnancy and are the first cells to differentiate from the fertilized egg. [Wikipedia:Trophoblast]
Note
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