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Figure 1. Control embryo after 7 hours of development	Figure 2. Embryo in calcium-free seawater from fertilization after 7 hours of development
Figure 3. Sea Urchin embryo 20 hours after fertilization under control conditions. The embryo is in late gastrulation stage.	Figure 4. Embryo in calcium-free seawater from fertilization after 20 hours of development
Figure 5. Embryo placed in calcium-free seawater at the vegetal plate stage after 20 hours of development

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