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A semi-thin section of a 21-dpi T. pratense root nodule induced by the R. leguminosarum bv. trifolii rosR mutant Rt2472. Abbreviations: M, meristematic zone; IZ, infection zone; OC, outer cortex; R, root; arrow, inner cortex; arrow head, nodule endodermis; white asterisk, infected cells; black asterisk, uninfected cells. Bar = 100 μm.
