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In this study, a transformation system enabling large-scale gene recombination was developed for the hyperthermophilic archaeon Thermococcus kodakarensis. Using the uracil auxotroph T. kodakarensis KU216 (∆pyrF) as a parent strain, we constructed multiple host strains harboring two 1-kbp DNA regions from the genomes of either the hyperthermophilic archaeon Pyrococcus furiosus or Methanocaldococcus jannaschii. The two regions were selected so that the regions between them on the respective genomes would include pyrF genes, which can pot