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| com·pan·ion cell (plural com·pan·ion cells) |
noun |
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| Definition: |
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cell associated with sieve tube: in flowering plants, a cell that lies alongside a sap-conducting sieve-tube element, whose function it is thought to influence. Companion cells have a prominent nucleus and dense cytoplasm, and form fine cytoplasmic connections plasmodesmata with the adjacent sieve-tube element.
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