Human trophectoderm becomes multi-layered by internalization at the polar region

Abstract excerpt

To implant in the uterus, mammalian embryos form blastocysts comprising trophectoderm (TE) surrounding an inner cell mass (ICM), confined to the polar region by the expanding blastocoel. The mode of implantation varies between species. Murine embryos maintain a single layered TE until they implant in the characteristic thick deciduum, whereas human blastocysts attach via polar TE directly to the uterine wall....

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