Fig. 4. Tbx1 determines the position of neural bHLH gene expression domain
borders. (A) Expression domain morphologies (colored regions) revealed by 3-D
reconstruction of serial section sets. Otocysts are shown in ventral view and
rendered transparently to visualize dorsal Tbx1 expression. Models
are normalized for AP length across stages. (B) 3-D reconstructions of the
otocyst showing the Ngn1 expression domain (green) at E10 for each
genotype.