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38. What are the derivatives of the neural crest cells?39. List two neural crest specifiers. What is their role?
40. What are the two pathways for the trunk neural crest cell migration? What is the destinyof cells which take each of the pathways?41. What are the roles of ECM in migration of neural crest cells?42. What are the cranial neural crest cells going to form? (in general)STUDY QUESTIONS 443. How does amount of yolk influence cleavage in birds? How do we call this type of cleavage?44. What are the characteristics of mammalian early cleavage?