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Kinetics of endogenous β-galactosidase specific activities of strains PhB1010 (parental strain) (closed circle), PhB1011 (cmlA1) (open circle), PhB1010/pBR322 (closed square), and PhB1010/pBRCMLA (open square) after addition (at time zero) of 5 × 10−5 M IPTG to broth. β-Galactosidase was assayed according to Miller (20).
