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Growth of the P. naphthalenivorans CJ2 wild type and its mutant derivatives, CJM110 and CJ2ΔnagX, in liquid minimal media containing naphthalene (A) and 3-hydroxybenzoate (B) as the sole carbon sources. Growth was determined by measuring the OD600. Strain CJΔnagX is the nagX deletion mutant. Strain CJM110 has a truncated nagR2 gene, which encodes a MarR-type repressor. This mutation results in the elevated expression of nagX.
