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TEM micrographs of root nodule contents (bar = 2 μm). (A) Thirty-day-old colonized nodule, with vigorous bacteroids, a lack of vacuoles, and less accumulation of RER and polysomes. (B) Thirty-day-old control nodule with senescent bacteroids, more vacuoles, and greater RER and polysome accumulation. Abbreviations: B, bacteroids; R, RER and polysomes; S, starch deposits; V, vacuoles.
