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Evaluation of production performance of KrPL lon and lacY+ mutant strains at 0 °C. β-galactosidase specific activity (U/mg) in lacY+ and lon mutant cells harboring p79C-lacZ, collected after progressive times of induction, in GG medium at 0 °C using different concentrations of inducer. Levels of β-galactosidase activity are expressed as mean ± SD, n = 3.
