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Fig. 1 | Zoological Letters

Fig. 1

From: Evolution of cis-regulatory modules for the head organizer gene goosecoid in chordates: comparisons between Branchiostoma and Xenopus

Fig. 1

Schematic representations of organizer gene expression patterns. a Expression patterns of lim1, otx2 (otx in amphioxus), goosecoid (gsc), and chordin (chrd) of Xenopus (top) and amphioxus (bottom) at the early gastrula stage (left) and the late neurula stage (right) are shown with colors as indicated. bi Whole-mount in situ hybridization of gsc in B. japonicum embryos. In mid-gastrula (stage G5–6), Bj_gsc is expressed in the dorsal mesoderm (bd). In late gastrula (stage G7–N0), Bj_gsc is still expressed throughout the dorsal mesoderm (e, f). In early neurula (stage N1), Bj_gsc expression is still strong in the posterior mesoderm but very weak in the anterior mesoderm (g, h). In mid-neurula (stage N2), Bj_gsc is expressed in the posterior mesoderm (arrowhead) and weakly in the dorsal endoderm (open arrowheads) (i). Embryos are shown in lateral view with dorsal to the top and anterior to the left (B, e, g, i), dorsal view with anterior to the left (c, f, h), or blastoporal view with dorsal to the top (d). *, blastopore

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