Problem:
Question 1: What's the notochord? Do we have one? Is it a neural structure?
Question 2: The proneural region has "stochastic cell fate determination." What does this mean? What happens if I pick an undifferentiated cell and inhibit notch? What if I stimulate notch?
Question 3: In axon guidance, what's the difference between a 'trophic' and a 'tropic' factor?
Could someone help to explain the answer of these questions.