Fig. 5. Pd-six1/2, Pd-atonal and Pd-opsin at the onset of photoreceptor differentiation at 43 hours. Apical views at 43 hours of development. Expression of six1/2 (A) pax6 (B), ath (C) and r-opsin (D) in the differentiating adult eye. Black arrowheads point at isolated dorsal cells constantly expressing pax6. Cellular resolution of the whole-mount in situ analysis and the determinate development of Platynereis allow the direct comparison of the expression patterns using morphological landmarks (schematic drawings in the middle part of the figure).
