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Conditions as in the legend for Figure 2. Lane 1, free DNA; Lane 2 DNA with 10 µM PtxS; Lane 3, DNA with 10 µM PtxR; lane 4 DNA with 10 µM PtxS +10 µM PtxR, lane 5 as lane 4 but with 1 mM 2-ketogluconate.
