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March 25, 2013
Transmission electron microscope image of Strongylocentrotus drobachiensus [sea urchin] pluteus. This freeze fracture replica of a septate junction at the apical end of an epithelial cell, shows 8-11nm particles on the E face and cooresponding grooves on the P face. Apical end of the cell is at the bottom of the image. 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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