Fig. 8.

Fermentation processes of B. licheniformis DW2 and DW-BCAA6. A: Bacitracin yields and cell biomasses of DW2 and DW-BCAA6 during bacitracin production, B: The concentrations of intracellular BCAAs, C: The concentrations of extracellular BCAAs, D: The concentrations of main byproducts, acetic acid, acetoin and 2,3-butanediol. Each experiment was repeated at least three times, and data are represented as the means of three replicates and bars represent the standard deviations, ∗, P ​< ​0.05; and ∗∗, P ​< ​0.01 indicate the significance levels between recombinant strains and control strain.