Figure 9.
Fgf3 expression in the presumptive second branchial arch ectoderm is altered before neural crest cell migration defect in Fgfr1n7/n7 embryos. Fgf3 and Crabp1 expression in wild-type (A,C,E,G) and Fgfr1n7/n7 (B,D,F,H) embryos at 8-somite stage. Expression of Fgf3 in ectoderm overlying the second branchial arch (A,C) is down-regulated in Fgfr1n7/n7 mutants (arrows in B,D). At the same stage, Crabp1 expression in neural crest cells is similar in wild-type (E,G) and Fgfr1n7/n7 (F,H) embryos.