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Optical (A,B,D,E) and electronic (C,F) microscopy of nodules induced by different S. fredii strains in soybean cv. Williams 82. (A) NGR234; (B,C) HH103 RifR; (D) USDA193C pSymNGR234M; (E,F) NGR234C pSymHH103M. Bars correspond to 100 μm in (A,D), 30 μm in (B,E), and 2 μm in (C,F).
