Dynamics of sine-oculis1 expression during brain overgrowth. All panels show the left half of the head lobes in frontal view (A to J). Expression in the primordia of the median eyes is denoted by the asterisk, expression in the lateral eye primordia is indicated by white arrowheads in all panels. The dotted line shows the leading edge of the non-neurogenic head ectoderm that overgrows the brain anlage. The developmental stage is indicated in each panel in the lower left corner.