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Two plasmids are used in a recombinant DNA procedure.Plasmid 67A carries a gene for resistance to the antibiotic ciprofloxacin,and plasmid 65B carries a gene for resistance to the antibiotic tetracycline.The plasmids are cut with HindIII restriction endonuclease,and then mixed with DNA ligase.In this procedure,what is the role of tetracycline?
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