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Abnormal duplication of the zone of polarizing activity (ZPA) may lead to which of the following deformities?
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Congenital unilateral transverse absence of the forearm results from vascular insult to which of the following?
Limb bud mesoderm
Apical ectodermal ridge
What is the function of the homeobox gene products in the axial skeleton?
Create cross links between collagen fibers
Regulate somitogenesis of the axial skeleton
Stimulate calcification in the hypertrophic zone
Cause a mutation which stimulates cell proliferation
Mediate the activity of the polarizing zone
The sclerotome of the somites develops into what mature anatomical structure?
Autonomic nervous system