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7. What is the role of ephrin and ephrin receptor in somite formation?8. Describe the process of somite epithelization. What are the roles of fibronectin and N-cadherin?
9. Do somites continue to exist in the body, or are they only temporary present in the embryo?10. Somites first subdivide into sclerotome, dermatome and myotome. What signals are involved in these subdivisions and where are they coming from?11. Which cells (derivatives of what) are forming an anterior part of each of the vertebra (cartilages, and then bones)? Which cells are forming a posterior part ofeach of the vertebra? Why does this happen?