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A shoot-borne nodal root (PO:0003005) formed at a stem base (PO:0008039).
A region of the root between the meristem and the region of rapid elongation in which isodiametric growth (cell expansion) occurs.
A root primordium (PO:0005029) that is committed to the development of a shoot-borne root (PO:0000042).
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