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. 2021 Aug 19;8(1):77. doi: 10.1186/s40643-021-00429-8

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© The Author(s) 2021

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Fig. 1 — a Schematic diagram of D-psicose and lipase co-production using co-culture strategy; b Gram staining methods to identify mixed strains; c SDS-PAGE analysis of protein level in co-culture system. (Line M, standard protein band; Line 1, the protein level band of recombinant B. subtilis; 2, the protein level band of recombinant E. coli; 3, the protein level band of recombinant B. subtilis and E. coli.)