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Fig. 1 | EvoDevo

Fig. 1

From: Early expression onset of tissue-specific effector genes during the specification process in sea urchin embryos

Fig. 1

Cell fate segregation during development of the sea urchin H. pulcherrimus. The timing of cell fate segregation and embryonic stages were defined based on previous work using the sea urchin S. purpuratus [14, 25, 27, 29, 30, 36]. Embryonic stages at each developmental time (0, 6, 8, 10, ... 30 hpf) in H. pulcherrimus were defined with reference to the previous descriptions and our observations [22]. Based on the above information, cell fate segregation along developmental time in H. pulcherrimus was estimated. Egg cleavage generates three cell lineages of mesomeres, macromeres and micromeres, segregating to the apical/nonapical ectoderm, Veg1/2 and skeletogenic/germline lineages, respectively. Each lineage segregates further to establish and differentiate various tissues, such as the apical organ, cilia, mid/hindgut, pigment and skeletogenic cells. Cell lineages (top) and cellular regions in an embryo (bottom). Apical ectoderm, Veg1 endoderm, Veg2 endoderm, NSM and skeletogenic cells are highlighted in blue, gray, green, yellow and orange, respectively. EB early blastula, HB hatched blastula, MB mesenchyme blastula, EG early gastrula and LG late gastrula

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