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The MucA′B complex is more mutagenic than UmuD′C. Derivatives of GY9743 (ΔumuDC) carrying plasmid pRW294 (mucA′B) (filled squares) or plasmid pGY9863 (umuD′C) (filled circles) and GY4587 (umuDC+) (open triangles) were assayed for UV-induced Arg+ (left panel) or Rifr (right panel) mutants after exposure to the UV doses indicated on the abscissa.
