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Hydrolysis of 600 mg of methyl paraben liter−1 (4.0 mM) (solid lines) and production of p-hydroxybenzoic acid (dotted lines) by E. coli DH5α containing the prbA gene cloned in the pGEM-T Easy vector (♦ and ⋄), by the E. cloacae strain EM (• and ○), and by E. coli DH5α containing the pGEM-T Easy vector alone (▪ and □).
