Abstract
In this chapter, we detail the experimental protocol leading to the generation of stem cell-based mouse embryo-like structures termed "ETiX-embryoids." ETiX-embryoids are formed from combined embryonic stem cells, trophoblast stem cells, and embryonic stem cells transiently induced to express Gata4. Cells are seeded into AggreWell dishes where they form aggregates that develop to resemble post-implantation mouse embryos following 4days of culture. ETiX-embryoids establish an anterior signaling center and undergo gastrulation over the following 2days. By day 7, ETiX-embryoids undergo neurulation and form an anterior-posterior axis with head folds at one end and a tail bud on the other. On day 8, they develop a brain and form a heart-like structure and a gut tube.
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