Fig. 3. Expression of Astyanax Dlx2 orthologs. (A-D) Anterior progression of mouth in live larvae (ventral views, anterior to left). Arrowhead indicates lower jaw. (E-H) dlx2b expression in ventral whole mount (anterior to left). Arrowheads indicate putative odontogenic epithelium. Arrow indicates additional faint epithelial expression domain in a maxillary process unlikely to be related to dentition. (I) Transverse section showing dlx2b expression in epithelium of the upper tooth germ (arrow). (J-M) dlx2b expression in sagittal sections. Odontogenic epithelium labeled as in E-H. Note the mineralization in M (arrow). (N) Transverse section showing dlx2b expression in epithelium of the mandibular tooth germ (arrowhead). (O-S) dlx2a expression in ventral whole mount (O-R) and transverse section (S). Arrowheads indicate odontogenic epithelium and arrows expression in lateral jaw mesenchyme. Note expression in the epithelium (arrowhead) and mesenchyme of the tooth germ in S. f, forebrain; h, heart; mc, Meckel's cartilage; y, yolk. Scale bars: 100 µM.