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Phenotypes of stem nodules formed by mutant strains with deletion of K+ uptake system genes. Stem nodules formed by the indicated strains were observed at 12 dpi. (A) Images of the hand-cut stem nodules. (B) N2 fixation activities of the stem nodules as assessed by ARAs. Data are presented as the means ± standard deviations from five separate plants. FW, fresh weight.
