| companion cell n. A specialized parenchyma cell, located in the phloem of flowering plants and closely associated in development and function with a sieve-tube element. |
companion cell (k m-p n yn) A specialized parenchyma cell, located in the phloem of flowering plants and closely associated with the development and function of a sieve-tube element. Companion cells probably provide ATP, proteins, and other substances to the sieve-tube elements, whose cytoplasm lacks many structures necessary for cell maintenance. |
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