Fig. 4. Platynereis pax6, Pd-six1/2 and Pd-atonal in larval eye development. Apical views of whole-mount in situ stained embryos showing the pattern pax6 (A,D,G,K), six1/2 (B,E,H,L) and atonal (ath) (C,F,I,M) expression at 15 hours (A-C), 19 hours (D-F), 24 hours (G-I) and 36 hours of development (K-M). In 36-hour-old larvae (K-M), the axonal scaffold was counterstained with anti-acetylated tubulin antibody. Developing or mature larval eyes are indicated by white arrows. Black arrowheads point at isolated dorsal cells constantly expressing pax6.