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A portion of primary xylem (PO:0000272) tissue that has as part one or more protoxylem tracheary elements (PO:0025575) embedded in parenchyma (PO:0005421) tissue.
A portion of procambium (PO:0025275) tissue that undergoes differentiation to form the primary vascular tissue (PO:0025408) of a root (PO:0009005).
A portion of procambium (PO:0025275) tissue that is part of a shoot system (PO:0009006).
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