Fig. 10

This differentiation tree indicates tissues determined from cleavage to the end of gastrulation. All tissues types should be considered “presumptive”, meaning that their names refer to the kinds of tissues that form from them. Red, shift to right and the letter C indicate a contraction wave and green, shift to right, and the letter E an expansion wave. Staging numbers and hours since fertilization on the left and right are from [184] and indicate the duration of each wave. Note each wave may pass through one tissue and continue into an adjacent tissue and so, for example, E3 begins endodermal tissue and then continues into mesodermal tissue