Mention the event that leads to the development of placenta during pregnancy in human female
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The human placenta develops from the trophectoderm (TE), the outer layer of the pre-implantation embryo, which forms at ∼5 days post fertilisation (dpf). At this stage, the pre-implantation embryo (termed a blastocyst) is segregated into two lineages: the inner cell mass (ICM) and the TE.
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