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**It achieves this by coordination of it's own patterning with the underlying mesoderm i.e. dorsal ectoderm gives rise to dorsal mesoderm.
 
**It achieves this by coordination of it's own patterning with the underlying mesoderm i.e. dorsal ectoderm gives rise to dorsal mesoderm.
 
*Dorsal - ventral patterning controls the positioning of the AER as it exists at the boundary of the dorsal and ventral aspects.
 
*Dorsal - ventral patterning controls the positioning of the AER as it exists at the boundary of the dorsal and ventral aspects.
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<big><center>[[Developmental Biology - Anatomy & Physiology|'''BACK TO DEVELOPMENTAL BIOLOGY]]</center></big>
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