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Mammoth-Mud-9609 t1_jdlwope wrote

Not only that, but most of the blastocyst, (ball of cells which becomes the foetus) about 160 out of the 200 cells form the placenta with only the remaining 40 cells developing into the foetus.

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PurpleSignificant725 t1_jdmooo5 wrote

And those 40 cells differentiate into 3 subtypes prior to beginning their development. Gestation is wild

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