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Maxillary neural crest cells fail to extend anteriorly in pdgfra−/−;pdgfrb−/− mutants. Stills of supplemental movie S3 showing maxillary neural crest extending anteriorly in pdgfra−/−;pdgfrb−/− mutants early, then retracting posteriorly later (arrowhead). A gap in the condensation is also present at the beginning of the movie (arrow). Scale bar= 50 µm.
