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The effects of exogenous autoinducers on siderophore formation in AS7 (c)—(a): (2), 10 μM C6–HSL; (3), 20 μM C6–HSL; (4), 40 μM C6–HSL and (b): (6), 10 μM C8–HSL; (7), 20 μM C8–HSL; (8), 40 μM C8–HSL. (1) and (5) was as the control. Data were presented as the mean ± standard deviation (n = 3; * p < 0.05; ** p < 0.01).
