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dNTP levels in recA730 and related strains. dNTP levels were determined by HPLC analysis as described in the Materials and Methods section. The numbers represent the mean of three independent experiments and are expressed on the Y-axis as milliabsorbance units (A260) measured by the HPLC instrument per OD600 of the bacterial cultures at harvest. Strains used were EC9428 (wt), EC9461 (dcd), EC9487 (ndk), EC9477 (recA730), EC9471 (recA730 dcd) and EC9503 (recA730 ndk) (see Table 1).
