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. 2017 Feb 16;7:41861. doi: 10.1038/srep41861

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Concentration scale in wt% dry weight or in μg g⁻¹ dry weight. X, xylem; P, phloem; C, cortex; E, epidermis ; Pd, periderm; VC, vascular cambium; YX, younger xylem; OX, older xylem. Scale bar – 1000 μm.