Fig. 4 neurog1 is required to induce her4 expression in the neurogenic domain.
(A, A′) In situ hybridization for her4 expression in wild-type embryos. her4 expression is detected in both, the anterior sensory domain and the neurogenic domain (arrow A′), but not in the posterior sensory domain (arrowheads A, A′). (B–B′) In situ hybridization for her4 expression in neurog1-/- embryos. Her4 is not expressed in the neurogenic domain (arrow B′) and her4 expression in the posterior sensory domain is detected (arrowheads B, B′). Dashed circles delineate otic vesicles. All images are at same magnification. Scale bar: 25 µm.