Fig. 7. Hindbrain expression of Wnt3a, but not Wnt1, expands ventrally in r5-6 of Fgf3 mutants. Whole-mount mouse embryos were probed with Wnt1 (A,B) or Wnt3a (C,D) and sectioned transversely (A',B', Wnt1; C',D', Wnt3a anterior; C'',D'', Wnt3a central; C''',D''', Wnt3a posterior) at the locations indicated by the labeled white lines in A-D. Embryo stages and genotype abbreviations as for Fig. 4.