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Alfalfa nodules induced by wild-type and dctA mutant strains of S. meliloti. Nodules were induced by wild-type S. meliloti Rm1021 (a), dctA deletion strain WSUb20611-II (b), and WSUb20611-II(pSM100-53) (c). c.1, Type A nodules; c.2, type B nodules. Bar, 1 mm.
