Assertion: zygote's cell | /r/CapableOf | exist before fourth cell division
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text: Elevated nuclear expression of the transcription factor Cdx2 in the still plastic outer cells of the morula embryo represents the earliest events in lineage specification [88–90]. Unequivocal nuclear Cdx2 in mice is detected in the prospective TE cells only after the fourth embryonic cell division (the cell division from cells of the eight-cell embryo to generate the 16-cell embryo) , indicating that totipotent cells in mice may exist before the fourth cell division.