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Figure 1


Fig. 1. Territories of the late-blastula stage sea urchin embryo. The different cell territories of the embryo are shown in different colors, and the central blastocoel cavity is shaded gray. The oral-aboral (OA) and animal-vegetal (AV) axes are also shown. AE, aboral ectoderm; AP, apical plate; BC, presumptive blastocoelar cells; EN, endoderm; NSM, non-skeletogenic mesoderm; OE, oral ectoderm; OLE, oral-lateral ectoderm; PC, presumptive pigment cells; PMC, primary mesenchyme cells (skeletogenic mesoderm); SMic, small micromeres.





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