Time course of cell growth and tyrosinase activity influenced by O
. The freshly transformed E. coli JM109 (pMFvpt) recombinant cells were grown in shake flasks at 37°C and induced at the early exponential growth phase with 1.0 mM IPTG. The arrow indicates the time of IPTG induction. Data points are the averages of the results of duplicate measurements.