Biology / Bio 0311 · Atom · ~20 seconds
Tight Junctions
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A tight junction is a watertight seal, built mainly from claudin and occludin proteins, that holds two adjacent animal cells tightly together.
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Tight junctions between cells lining the urinary bladder keep urine from leaking into surrounding tissue.
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A tight junction seals space between cells; students often mistake it for a channel like the gap junction, which instead lets molecules pass through.