Watch the following video and then answer the questions below.
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1. What is a morphogen? How is it related to what we learned in this module? How is it related to the embryonic development?
2. Pick a morphogen (several were described by Dr. Barresi, including BMP, Shh, Wnt, Fgfs), look up an anatomical structure that it is involved in patterning, and describe that process here. Name the ligand, the receptor, what is happening on the level of individual cells, and what is happening on the level of tissues.