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Growth of wild-type (WT) and putative outer membrane receptor mutants on pyoverdine PL-8 or rhodotorulic acid as the sole iron source. The parent B. japonicum strain LO, irr mutant strain, and the ferric siderophore receptor mutants, defective in the blr3555 (3555), blr3904, blr4504, bll4920, or bll7968 genes were spotted on plates where the sole iron source was pyoverdine PL-8 or rhodotorulic acid, and the ability of the strains to grow was assessed visually.
