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4/7: 4JunctionFreezeFracture

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4JunctionFreezeFracture

Caption

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

Writer

Louisa Howard, Evelyn Spiegel

Keywords

marine invertebrate, TEM, junction, freeze fracture