Uncovering the hidden origins of the placenta
When an embryo attaches to the wall of the uterus roughly six days after fertilization, it begins to build the body and placenta. Called implantation, this is t…
When an embryo attaches to the wall of the uterus roughly six days after fertilization, it begins to build the body and placenta. Called implantation, this is the stage of life scientists know least about. It is also the stage when most pregnancies are lost.
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