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5.1 Echinoderm First Cleavage. 5.2 Echinoderm Second Cleavage. 5.3 Spindles at Fourth (unequal) Cleavage in a Purple Sea Urchin, Strongylocentrotus. 5.4 Normal Sea Urchin Development. 5.5 Sea Urchin Blastula. 5.6 Sea Urchin: Ingression of Primary Mesenchyme Cells.
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5.3 Spindles at Fourth (unequal) Cleavage in a Purple Sea Urchin, Strongylocentrotus
5.7 Sea Urchin: Ingression of GFP-Labeled Primary Mesenchyme Cells
5.10 Polar Lobe Formation in the Scaphopod Mollusc Pulsellum