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Tight junctions

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Tight junctions

the tight junctions is a belt shaped and expands around the apex of columnar epithelial cells. at low magnification of the electron microscope the tight junction appear to be fused but in higher magnification electron micrographs revails that the membrane are in contact only in the point of tight junctions, function the tight junctions not only maintain the firm between two adjacent cells but also helps as barrier for the moment of certains molecules from adjacent cells.( bidur marasini sichuan university)