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March 25, 2013
Transmission electron microscope image of Strongylocentrotus drobachiensus [sea urchin] gastrula. This tangential thin section at the apical end of an epithelial cell shows a septate junction. The straight, unbranched septate junction is present throughout embryogensis and may act as a permeability barrier, as well as having adhesive properties. Class Echinoidea Superorder Echinacea Order Echinoida Strongylocentrotus drobachiensus JEOL 100CX TEM Credit: Louisa Howard, Evelyn Spiegel

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