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Iron transport mediated by 55Fe-siderophore complexes at 37 °C in iron-limited medium in B. subtilis strains (A) yclNd, (B) yclNd+pHCMC05-yclN, (C) yclPd, (D) yclPd+pHCMC05-yclP, (E) yclQd, and (F) yclQd+pHCMC05-yclQ; black circles 55FeBB, white triangles 55FePB, black squares 55FePBν, and white diamonds 55Fe(3,4-DHB). The mutant strains were grown in the presence of 0.5 mM IPTG and appropriate antibiotics. Data presented are the average of two to four independent experiments.
