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. 2008 Jan 11;363(1496):1493–1501. doi: 10.1098/rstb.2007.2239

Figure 4.

Figure 4

Gene expression of ClEvx, ClCdx, ClVax, ClPax6 and ClEmx during acoel development and NvEvx in the sea anemone Nematostella vectensis and CapI-cdx, CapI-vax in the annelid Capitella sp. I. (a) Expression of ClEvx in an acoel embryo with approximately 250 cells. The expression seems to be sparsely distributed in isolated cell (arrows). (b) ClEvx expression in a hatchling of C. longifissura. The expression is found in median neurons anterior and posterior to the statocyst. Lateral view, anterior to the left. (c) NvEvx expression in a planula of the sea anemone N. vectensis. NvEvx is expressed in isolated neural cells in the ectoderm (arrows). Later in the polyp (d), Nvevx is expressed in cells at the base of each tentacle (arrow); oral pole to the left. (e,f) ClCdx expression in a C. longifissura hatchling. ClCdx is expressed in the nervous system along the whole body. (e) Ventral view, (f) lateral view; asterisk indicates anterior end at left. (g) Cdx expression in the annelid Capitella sp. I is expressed all along the body axis, mainly in the mesodermal layer (dorsal view; Fröbius & Seaver 2006). (h) Expression of the gene ClVax in a C. longifissura hatchling. The gene is expressed in the ectoderm ventral and anterior to the mouth opening to the anterior tip of the animal (ventral view). (i) Lateral view of (h). (j) CapI-vax expression in the annelid Capitella sp. I. CapI-vax is expressed in the ectoderm anterior to the mouth opening (mo) on the dorsal side and in the dorsal hemisphere of the prototroch (not shown); lateral view. (k) Expression of the ‘anterior’ gene ClEmx in the acoel C. longifissura. ClEmx is in the late embryo along the entire length of the body; lateral view. In the hatchling (l) it is expressed in the nervous system, primarily on the ventral side (lateral view). (m) ClPax6 expression in a late embryo of C. longifissura. ClPax6 is expressed in an ectodermal ring of cells, separating the dorsal and ventral hemispheres of the embryo, but not in the position of the eyespots (dorsal view).