Fig. 4From: Enhanced extracellular raw starch-degrading α-amylase production in Bacillus subtilis by promoter engineering and translation initiation efficiency optimizationShake flask culture of the recombinant strains mediated by the dual-promoters for AmyZ1 production. A The extracellular activities and cell densities of strains with different dual-promoters. Error bars represent standard deviation. B SDS-PAGE analysis of AmyZ1. The target proteins were marked with arrowBack to article page