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5JunctionFreezefracture

Caption

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

Writer

Louisa Howard, Evelyn Spiegel

Keywords

mammalian, TEM, junction, marine invertebrate, freeze fracture