Biology / Bio 0773 · Atom · ~20 seconds
Direct Signaling via Gap Junctions and Plasmodesmata
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Gap junctions in animal cells and plasmodesmata in plant cells are direct channels letting small signaling molecules pass between adjacent cells without entering the extracellular space.
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A calcium ion moving through a gap junction lets one cell relay its signaled state directly to its neighbor.
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These channels admit only small molecules and ions — proteins and DNA are too large to pass.
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