Other Definitions
sieve tube (dict)
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Sieve TubeThe sieve-tube members are cells that lack a nucleus and certain other organelles such as ribosomes. The survival of sieve-tube members depends on a close association with companion cells. Sieve tube members are joined end to end to form a tube that conducts food materials throughout the plant. The end walls of these cells have many small pores and are called sieve plates.
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