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Fig. 2. Fgfr2IIIb expression is normal in the homozygous Fgfr2IIIc mutant. In situ hybridization analysis with a probe specific for exon 8 of Fgfr2IIIb. (A,C,E,G) bright-field; (B,D,F,H) dark-field views. (A-D) E12.5 limb bud, showing Fgfr2IIIb expression in surface ectoderm. (E-H) Parasagittal sections of the mid-trunk region of E14.5 embryos, showing Fgfr2IIIb expression in the bronchial epithelium of the lungs and the perichondrium of prevertebrae. pv, prevertebrae; lg, lung.