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March 25, 2013
Transmission electron microscope image of Arbacia punctulata [sea urchin] adult intestine. This freeze fracture replica shows the anastomosing, pleated septate junction at the apical end of an epithelial cell. Apical to the sharp border of this junction, in the desmosomal area(upper left of image), is a cluster of particles of irregular size that may be a desmosome. Class Echinoidea Superorder Echinacea Order Arbacioida Arbacia punctulata JEOL 100CX TEM Credit: Louisa Howard, Evelyn Spiegel

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