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Catechol (A) and peptide (B) concentrations in the culture supernatants of dhb mutants and the same mutants complemented with dhb genes. Cells of the parental strain, Streptomyces sp. strain ATCC 700974 (▴), the ΔdhbACE mutant SIP1192 (○), the ΔdhbCE mutant SIP1194 (□), and the dhbACEBG-complemented strains SIP1192(pSP126/1079) (•) and SIP1194(pSP126/1079) (▪) were grown in M9 minimal medium at 30°C.
