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Structure and ultrastructure of 4-week-old nodules. Nodules were incited by Rm1021 (A, C, and E) and SmgshB (B, D, and F) strains. The meristematic (I), infection (II), fixing (III), and senescent (IV) zones and II-III IZ are represented in A and B. a, amyloplast, and s, senescing bacteroid. Scale bars = 100 (A and B), 10 (C and D) and 1 μm (E and F).
