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Siderophore-related gene expression and siderophore production in Bacillus sp. WR13 under Fe-sufficient (Fe+) and Fe-deficient (Fe−) conditions. (A) Gene expression related to siderophore synthesis and transportation; (B) gene expression related to Fe-BB uptake and hydrolysis. (C) Quantitative analysis of siderophore. Data are expressed as the means ± SD (n = 3). * p < 0.05 and ** p < 0.01 indicate significant and extremely significant differences.
