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The trophoblast is mostly responsible for forming the placental tissue. The trophoblast is the outer layer of the blastocyst.
Trophoblasts are cells forming the outer layer of a blastocyst, which provides nutrients to the embryo, and develops 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.
Thus, The trophoblast is mostly responsible for forming the placental tissue.
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