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Schematic illustration of lateral root branching response to availability of water in A. thaliana (A) and of nitrate in maize (B). ARF, auxin response factor; IAA3, Aux/IAA3 (Aux/indole-3-acetic acid protein 3); KRP, Kip-related protein; LBD, LATERAL ORGAN BOUNDARIES (LOB) domain; LR, lateral root; LRE, lateral root emergence; LRP, lateral root primordia; PIN, PIN-Formed; SUMO, small ubiquitin-like modifier.
