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Restriction analysis of plasmids pTFK1 and pTFK2 of theAcidithiobacillus ferrooxidans strain TFBk was carried out, and the sizes of these plasmids were determined (13.5 and 30 kb, respectively). A macrorestriction map was built for plasmid pTFK1. DNA–DNA hybridization revealed that the plasmids contained homologous nucleotide sequences. Plasmid pTFK2 labeled with 32P was used as a probe for Southern...
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