Embryonic expression of pax6 homologues in the head of P. tepidariorum.
(A to E) Expression of Pt-pax6.1 during head development. A large connected domain in the brain anlage is denoted by arrowheads in A and B. (F to J) Expression of Pt-pax6.2 during head development. A transversal stripe of expression is denoted by the arrowhead in F. All embryos are shown in frontal aspect. The developmental stage is indicated in each panel in the lower left corner.