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Ability of S. meliloti 1021-derivative mutants to grow in MM supplemented with 10 mM KCl (A), 10 mM KCl and 0.3 M NaCl (B), 20 mM KCl (C), or 20 mM KCl and 0.3 M NaCl (D). In each row, drops contained approximately the number of CFU indicated on the left. A representative example of at least two experiments is shown. Pictures were taken after 4 to 6 days of incubation under the indicated conditions.
