Fig. 2. flh regulates the expression of ash1a, ngn1 and neuroD in the epiphysis. Dorsal views of whole brains with anterior at the top, showing expression of ash1a, ngn1 and neuroD in the epiphysis of wild-type (WT) and flh-mutant embryos at 14- and 24-somite stages. Genotype is indicated above, genes analysed on the left of the panels, and stage in the bottom right of each image. Flh is required for the maintenance of ash1a expression (D) and for the activation of ngn1 and of neuroD expression (F,J). Scale bar: 15 µm.