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Symbiotic phenotypes of the mutants: alfalfa plants growing on plates inoculated with Rm1021 (+wt) (A), no bacterial cells (B), the lsrA1 mutant (E), or the lsrB1 mutant (F) and root systems of alfalfa plants inoculated with Rm1021 (C), no bacterial cells (D), the lsrA1 mutant (G), or the lsrB1 mutant (H).
