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Glossary of Plant Anatomy

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quaternary leaf vein [PO:0008022; plant anatomy term ]
A leaf lamina vein (PO:0020138) arising from a tertiary leaf vein (PO:0008021).

quiescent center [PO:0020149; plant anatomy term ]
A portion of meristem tissue (PO:0009013) that is part of a root apical meristem (PO:0020147) and consists of mitotically and metabolically inactive cells and is located behind the protoderm (PO:0006210) of the root (PO:0009005).