Figure 6

Segmental expression of PRGs in Glomeris (ventral segments only), Tribolium and Drosophila. Schematic drawing and colour coding is based on [70]. Expression of en (red), wg (blue), prd (purple), slp (yellow), opa (dark blue), run (petrol) and eve (brown). Black lines represent parasegment boundaries; grey lines represent segment boundaries. The expression of the segment polarity genes en and wg is conserved, as well as that of the PRG slp. Expression of prd is conserved with modification in every other segment in Tribolium and Drosophila. Intra-segmental position of opa is conserved between Tribolium and Glomeris, which may reflect the ancestral pattern. Co-expression of eve and run is also conserved Tribolium and Glomeris, but at a different intra-segmental position.