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<rdfs:comment>The first identifiable region in the differentiating vascular cylinder is the pericycle. In the xylem the differentiation of the tracheary elements begins in a centrifugal direction but is completed in the centripetal direction. The first phloem elements mature before the first xylem elements.</rdfs:comment>
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<obo_purl:IAO_0000115>The stage at which the root vascular cylinder becomes evident.</obo_purl:IAO_0000115>
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