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March 25, 2013
Scanning electron microscope image of Strongylocentrotus drobachiensus [sea urchin] at the gastrula stage. Embryo was cut in half to reveal blastocoel cavity, containing blastocoel matrix material, primary mesenchyme cells and secondary mesenchyme cells migrating from the tip of the archenteron. Class Echinoidea Superorder Echinacea Order Echinoida Strongylocentrotus drobachiensus JEOL 35C SEM

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