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perforation plate
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Diagram comparing xylem and phloem cells, showing labeled illustrations of a vessel member, tracheids, and fiber for xylem on the left, and a sieve element, companion cell, sieve plate, sieve areas, and fiber for phloem on the right.
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vascular cells
Figure 6: Cells of the xylem and phloem.
Encyclopædia Britannica, Inc.