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Nodulation efficiencies of the wild-type strain and the exoR95 and exoS96 mutants. The average numbers of nodules per plant on alfalfa plants inoculated with Rm1021 and the exoR395 and exoS396 mutants were plotted based on the size of inoculum. The numbers of nodules were further divided into pink nodules (black bars) and white nodules (white bars).
