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Growth on biphenyl (A) and ethylbenzene (B) of the disruption mutants of bphS1 or bphS2. The bphS1 mutant, SDR1; the bphS2 mutant, SDR2; the bphS1/S2 double mutant, SDR21; SDR21 harboring pKTS2 containing bphS2; and SDR21 containing a vector control, pK4Ts, were grown in W minimal medium containing biphenyl (2 g/liter) or ethylbenzene. Ethylbenzene was supplied as vapor. Growth was monitored by measuring the OD600.
