11. Once this process is completed, gastrulation starts. 12. Inactivation occurs in the epiblast during gastrulation , which gives rise to the embryo. 13. Gsc is found in high concentrations in the dorsal mesoderm and endoderm during gastrulation . 14. Germ-band extension begins shortly after gastrulation and is divided into two phases. 15. At this point gastrulation is complete, and the gastrula has a functional digestive tube. 16. Chordin is also involved in avian gastrulation . 17. STAT3-deficient mouse embryos cannot develop beyond embryonic day 7, when gastrulation begins. 18. This perspective can shed new light on phenomena as diverse as gastrulation and germ line sequestration. 19. It is important to note that mice in which BMP4 was inactivated usually died during gastrulation . 20. Hensen's node is the site where gastrulation begins and it becomes the dorsal mesoderm.
