Figure 2. Amplicons of a 524bp fragment from the Rieske non-heme iron dioxygenase found in biphenyl degrading strains from this study. L: 100bp DNA ladder, 1: Rhodococcus pyridinivorans RM2, 2: Rhodococcus rhodochrous RM3, 3: Extensimonas perlucida RM1, 4