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Fig. 1. Organization of the pre-implantation and gastrulation-stage mouse embryo.
(Left) An E3.5 blastocyst. The inner cell mass (ICM) gives rise to the
epiblast lineages; the primitive endoderm (PrE) gives rise to parietal and
visceral endoderms; the trophectoderm (TE) to the extra-embryonic ectoderm.
(Right) An E6.5 gastrulation stage embryo with the organization of
embryonic/extra-embryonic tissue layers in detail.