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. 2009 Aug 7;75(19):6124–6131. doi: 10.1128/AEM.00809-09

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FIG. 4. — Assay for catechol 2,3-dioxygenase activity. Each of the Pasteurellaceae strains containing pMCsodCP (with the cloned A. pleuropneumoniae sodC promoter; right side of plate) produced bright yellow colonies (including those that are single and isolated) when sprayed with catechol, whereas there was no detectable color change for any of the strains containing pMC-Tandem (promoterless; left side of plate). Bacteria: Ap, A. pleuropneumoniae; Hi, H. influenzae; Hp, H. parasuis; Mh, M. haemolytica; Pm, P. multocida.