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March 25, 2013
Scanning electron microscope image of Strongylocentrotus drobachiensus [sea urchin] at the gastrula stage. Embryo was split open to reveal the blastocoel cavity. There are several migrating mesenchyme cells, with a variety of filopodial shapes. Class Echinoidea Superorder Echinacea Order Echinoida Strongylocentrotus drobachiensus JEOL 35C SEM Credit: Louisa Howard

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