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The serial dilution drop test of P. putida mutants: 1 – wild-type, 2 – alkB‾, 3 – alkA‾, 4 – ada‾, 5 – alkB‾ada‾, 6 – alkA‾ada‾, 7 – alkA‾alkB‾, 8 – alkA‾alkB‾ada‾ on the medium containing the indicated concentrations of MMS (A) or MNNG (B). The vertical arrow shows the direction of dilution: from 10-1 to 10-8.
