21. Later in development the yolk syncytial layer will be important in directing cell movements of gastrulation . 22. The expression of Gsc occurs twice in development, first during gastrulation and second during organogenesis. 23. GBX2 expression occurs during gastrulation and continues to be expressed in the later stages of embryogenesis. 24. However, some common features of gastrulation across digestive function of a large number of endodermal cells. 25. Experimentally modified embryos that do not express this protein will fail to develop mesoderm and initiate gastrulation . 26. Many TGF? ligands use this differentiation, apoptosis, gastrulation , embryonic development and the cell cycle. 27. A gain or loss of function of Prickle1 causes defects in the convergent extension movements of gastrulation . 28. Other genes that have been proposed for this purpose include Hnf4, which is required for gastrulation . 29. His research interests include the developmental biology of marine invertebrates and in particular the evolution of gastrulation . 30. HoxC6 was found to play an important role in gastrulation in the vertebrate " Xenopus ".