"Gut Formation". Formation of the 3 "germ layers" of which the body will be constructed.
"The most important event in your life is not birth, marriage, or death, but. -gastrulation." L. Wolpert
1. Morphogenetic movements
2. Slowed ceil division
3. Growt is insignificant.
4. Change in energy source; increase in oxidative metabolism
5. Nuclei begin controlling activities of cells
6. New kinds of proteins being svnthesized
1. Invagination
2. Epiboly
3. Delamination
4. Ingression
5. Changes in cell shape
6. Selective cell adhesion
A clue from sea.urchin twins: animalization and vegetalization
A mechanism: Gradients