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Fig. 5. Ectopic nuclei retained expression of Phox2b in wild-type, Hoxb1 and Hoxb2 mutant hindbrains at 12.5 dpc. Ventricular (A-C) and pial (D-F) views of flat-mounted wild-type (A,D), Hoxb1 (B,E) and Hoxb2 (C,F) mutant hindbrains at 12.5 dpc. At this stage, Phox2b was expressed in both Vm and VIIm in the wild type and the mutants (D-F, black arrowheads). Ectopic nuclei retained expression of Phox2b in both Hoxb1 (E, asterisks) and Hoxb2 (F, asterisks) mutants. Note the lack of Phox2b expression in the migratory path of the facial motoneurons.





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