1) Describe the three main morphogenetic movements that occur during zebrafish gastrulation and name the tissues or cell types that participate. 2) You transplant a piece of chicken neural tube – including the neural crest – from its position in somite 13 to a more anterior position at somite 5 in a separate embryo. You observe that the neural crest cells adopt the fate of neural crest cells in their new location. a) What does this result reveal about their specification state? b) What determines their eventual fate?