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Volumetric yield of soluble scFv-phOx (top) and cell densities (bottom) at different induction levels (m-toluate) in fermentations with E. coli RV308 strains harboring pJBphOx (low copy number) and its derivatives pJBphOx-271 (medium copy number) and pJBphOx-251 (high copy number). In all cases inducer was added at an OD600 of 90. The fermentation with RV308(pJBphOx-271) with 3 mM inducer was terminated 6 h after induction due to foaming and control difficulties caused by cell lysis.
