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Complementation test of the DZA315 alleles of the candidate genes NCR-α and NCR-β. Introduction of the DZA315 alleles of NCR-α (A) or NCR-β (B) into the NFS1−/− background of RHL-NFS1 failed to complement the Fix− phenotype. Inset figures showed GUS staining of the same nodules/roots in the main panel, as an indicator for the transgenic roots. (Scale bars: 1 mm.)
