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. 2019 Jul 27;9:120. doi: 10.1186/s13568-019-0845-y

Fig. 2.

Fig. 2

Concentration of surfactin homologues (a), iturin homologues (b) and lipopeptide (c) production at different shaking speeds. Values are expressed as mean ± SD, n = 5. The different letters indicate significant differences between treatments (p < 0.05)