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Extract model parameters from an early paper on lac induction

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Use the data in Sadler & Novick, JMB 1965 (pdf), Fig. 15, and information in the text, to determine the dependence of lac promoter activity on IPTG level in strain W14. With what exponent does the IPTG concentration enter into the equation? What is the IPTG concentration at half-maximal promoter activity?