#sieve_tube__sievetube  tube formed by cells joined end-to-end through which nutrients flow in flowering plants and brown algae
  supertype:  vascular_tissue  tissue that conducts water and nutrients through the plant body in higher plants
  part of:  phloem__bast  (botany) tissue that conducts synthesized food substances (e.g., from leaves) to parts where needed; consists primarily of sieve tubes

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