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Unformatted text preview: phloem in the primary root stele. Once formed, the cambium produces xylem inward and phloem outward. Additional parenchyma cells form rays Pericycle cells dedifferentiate to form a cork cambium, which produces a cork layer as well. The annual growth of "wood" and cork-like bark in secondary roots is very similar to stem secondary growth (to be discussed soon)....
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- Fall '09