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Conjugal mating between selenate-reducing Citrobacter sp. strain JSA and Escherichia coli S17-1 bearing pSUP2021 allowed transposon mutagenesis and chromosomal transformation. Kanamycin-resistant transconjugants were obtained successfully by this method from a freshwater selenate-respiring Citrobacter sp. strain JSA. The maximum frequency of kanamycin-resistant Tn5 transconjugants was 3.6 × 10−6 per...
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