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. 2016 Jul 29;7:1088. doi: 10.3389/fpls.2016.01088

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Copyright © 2016 González-Guerrero, Escudero, Saéz and Tejada-Jiménez.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Diagram of the main transport processes in roots, using Strategy I or Strategy II or the mycorrhizal pathway (left inset for uptake by Branched Absorbing Structures, right inset for metal delivery by arbuscules). At is used as a prefix to indicate A. thaliana proteins, Os for Oryza sativa, Zm for Zea mays, Mt for M. truncatula, Gint for Glomus intraradices, Ri for Rhizophagus irregularis, and AMF for arbuscular mycorrhiza. Epi stands for Epidermis, Cor for Cortex, End for Endodermis, Per for Pericycle, Xyl for Xylem, PM for Plasma Membrane, PAM for Periarbuscular Membrane, and Meⁿ⁺ for a general metal.