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Analysis of reporter gene expression in transgenic M. truncatula plants inoculated with the Rm7225 exoH mutant. A, Detail of a lateral root showing GUS activity in a deformed root hair and in cortical cells beneath 10 dai. B, Nodule primordia 12 dai showing GUS activity in the pericycle and in primordium cells. C, Nodule-like structure obtained 2 weeks after inoculation showing GFP fluorescence in central parenchyma cells. A, Bar = 10 μm; B, bar = 60 μm; C, bar = 20 μm.
