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Cell growth and surfactin production of BS‐37 supplemented with d‐/l‐Leu. (a) Biomass and surfactin production in cultures with l‐Leu. (b) The proportion of surfactin variants (c) Biomass and surfactin production in cultures with d‐Leu. (d) Surfactin production in 10 mM d‐Leu medium with l‐Leu supplementation. (e) Surfactin production time course. (f) Cell growth time course
