What is not a main role of the Apical Ectodermal Ridge (AER)
a) Maintaining the underlying mesenchyme in a proliferative and undifferentiated state – required for limb growth.
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b) To differentiate into limb muscle
c) Anterior-posterior axis (thumb to pinkie)
d) Interactions between the anterior-posterior and dorsal-ventral axes so that each cell is given instructions on how to differentiate