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Spatial expression of LjNRT2.1, LjNLP4, and LjNLP1 during nodulation. A–C, GUS activities in nodulating WT transgenic hairy roots transformed with the LjNRT2.1pro:GUS (A), LjNLP4pro:GUS (B), and LjNLP1pro:GUSplus (C) constructs. Arrows indicate dividing cortical cells. Transgenic roots were identified by GFP fluorescence. Scale bars = 200 µm.
