
Plasmodesmata (singular: plasmodesma) are microscopic channels which traverse the cell walls of plant cells and some algal cells, enabling transport and communication between them. Plasmodesmata evolved independently in several lineages, and species that have these structures include members of the Charophyceae, Charales, Coleochaetales and Phaeop...
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http://en.wikipedia.org/wiki/Plasmodesma

A fine protoplasmic thread connecting two protoplasts and passing through the wall separating the two protoplasts. (Pl. plasmodesmata.)
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http://ppathw3.cals.cornell.edu/glossary/Defs_P.htm

microscopic cytoplasmic canal that passes through plant-cell walls and allows direct communication of molecules between adjacent plant cells. ... [3 related articles]
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http://www.britannica.com/eb/a-z/p/77

<cell biology, plant biology> Narrow tube of cytoplasm penetrating the plant cell wall, linking the protoplasts of two adjacent cells. A desmotubule runs down the centre of the tube, which is lined by plasma membrane. ... (14 Oct 1997) ...
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A fine protoplasmic thread connecting two protoplasts and passing through the wall which separates the two protoplasts.
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(= plasmodesmata (plural)) Narrow tube of cytoplasm penetrating the plant cell wall, linking the protoplasts of two adjacent cells. A desmotubule runs down the centre of the tube, which is lined by plasma membrane.
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