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GFP expression as function of the arabinose concentration in cultures of E. coli CW2513 (open squares) and CW2587 (filled squares) harboring pAK02 (Ptac::araE) and pCSAK50 (araC-PBAD::gfpuv). Cells were preinduced with 32 μg of IPTG per ml. Six hours after addition of arabinose, the percentage of the population that was induced (A) and the population-averaged fluorescence (Fluorescence/OD ratio) (B) were determined.
