Trophoblast
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The trophoblast (from Greek threphein: to feed) is considered to be the first of all embryonic annexes. It secretes hCG in order to maintain progesterone secretion and sustain a pregnancy.
The trophoblast (from Greek threphein: to feed) is considered to be the first of all embryonic annexes. It secretes hCG in order to maintain progesterone secretion and sustain a pregnancy.
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