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tight junction
(redirected from Tight junctions)

    Also found in: Wikipedia 0.04 sec.
tight junction (tt)
n.
An intercellular junction between epithelial cells in which the outer layers of the cell membranes fuse, reducing the ability of larger molecules and water to pass between the cells.
tight junction
a cell junction in which there is no intercellular space between cell membranes and so is impermeable. See also cell junction.
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