An early mammalian lineage contributing to extraembryonic endodermal tissues. It is distinct from the definitive endoderm produced during gastrulation.
An extraembryonic endodermal epithelium associated with early mammalian development. It supplies signals and matrix and must be distinguished from definitive endoderm formed through gastrulation.
A signalling region that becomes positioned on the prospective anterior side of the mouse embryo and antagonizes posteriorizing signals, helping position the primitive streak.

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