Figure 1: Sea Urchin embryo 20 hours
after fertilization under control conditions. The embryo is
in late gastrulation stage. |
|
Figure 2: Control embryo after 7 hours of development |
Figure 3: Embryo in calcium-free seawater from fertilization after 7 hours of development |
Figure 4: Embryo placed in calcium-free seawater at the vegetal plate stage after 20 hours of development |
Figure 5: Embryo in calcium-free seawater from fertilization after 20 hours of development |
Last Modified: 26 April, 2001
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