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Effects of absence of UmuC-like protein on UV-targeted mutagenesis. The proportions of (A) rifampin- and (B) ciprofloxacin-resistant cells in ATCC BAA-854 (dark gray bars) and EH58 (light gray bars) were determined in cultures that were either untreated (1 and 2) or were exposed to UV doses of (3 and 4) 25 J/m2 and (5 and 6) 50 J/m2.
