Expression of Shh and β-catenin Transcripts in Normal (ApcCKO/CKO) and Mutant (K14-cre; ApcCKO/CKO) Embryonic Skin
(A–D) Section ISH with Shh probe in E14.5 normal (A), E14.5 mutant (B), E16.5 normal (C), and E16.5 mutant (D) skin. Broken lines indicate the interface between epithelium and mesenchyme. Scale bars: 50 μm. Whole mount in situ detection of β-catenin in E15.5 normal (E, G), mutant (F, H) embryos. Aberrant initiation of multiple hair placodes is evident at E14.5. Loss of K14-driven Apc loss caused aberrant pattern formation (F′) and formed ectopic hair placodes in normally hairless foot pads (H, arrows) which are absent in normal (G).