Figure 16.

Expression patterns of Pdu-Hey and their schematic representations in Platynereis larvae and during posterior elongation (PE). WMISH for the different stages indicated on each panel is shown. Pdu-Hey is first expressed in four bilateral patches at 33 h post fertilization (hpf), two of them being in each side of the ventral midline. At 48 hpf, Pdu-Hey + cells are observed in a larger territory, surrounding the ventral nerve cord (VNC), in addition to few brain cells, stomodeum cells and mesodermal patches. At 72 hpf, the expression is maintained in brain and stomodeum cells. During PE, Pdu-Hey is expressed in the ganglions of the VNC of mature segments as well as in specific spots of the dorsal mesoderm. For the larvae, panels are ventral views (anterior is up). Expressions patterns during PE are shown for both sides (anterior is up), V = ventral, D = dorsal. Deeper ventral view (different focus plane) is highlighted in red for 48hpf larvae.