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Histochemical localization of GUS activity in transgenic M. truncatula roots expressing the GUS reporter gene under the control of the MtNPF6.8 promoter. A, M. truncatula root expressing pMtNPF6.8:GUS stained histologically for GUS activity. B to E, Enlarged views of the primary root and of different developmental stages of LR: primary root near the shoot-root section (B), LR prior to emergence (C), LR immediately after emergence (D), and mature LR (E).
