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March 25, 2013
Scanning electron microscope image of Strongylocentrotus drobachiensus [sea urchin] gastrula. This is a higher magnification image of "05SeaUrchinSEM". Embryo was split open to reveal a nice cross-section through the outer epithelial layer. Class Echinoidea Superorder Echinacea Order Echinoida Strongylocentrotus drobachiensus JEOL 35C SEM Credit: Louisa Howard