Companion cells Provide the energy required for transporting substances in sieve tubes. Xylem Xylem vessels Transport water and dissolved minerals from the roots, up the plant. Growing points ...

Dissolved sugars and amino acids can be transported both up and down the stem. Companion cells, adjacent to the sieve tubes provide energy required to transport substances in the phloem.

Agilent PD-L1 IHC 28-8 pharmDx Receives EU IVDR Certification as a Companion Diagnostic Test for Non-small Cell Lung Cancer and Melanoma Indications Agilent Technologies Inc. (NYSE: A) today ...