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===Circumpharyngeal ridge===
Cell migration towards the circumpharyngeal ridge is forced to paused to allow for the formation of the caudal pharyngeal arches.<ref name="pmid20890117"/> Little is known about this pausing mechanism, but studies conducted in chicks have uncovered the role of [[mesoderm]] expressed factors EphrinB3 and EphrinB4 in forming fibronectin attachments.<ref name= "pmid12117812" >{{cite journal |vauthors= Santiago A, Erickson CA | title = Ephrin-B ligands play a dual role in the control of neural crest cell migration | journal = Development| volume = 129| issue = 15 | pages = 3621–3623| date = 2002| pmid = 12117812}}</ref>
===Caudal pharynx and arch artery condensation===
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