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Interspecies bacterial communication is mediated by autoinducer‐2, whose synthesis depends on luxS. Due to the apparent universality of luxS (present in more than 40 bacterial species), it may have an ancient origin; however, no direct evidence is currently available. We amplified luxS in bacteria isolated from 25‐ to 40‐million‐year‐old amber. The phylogenies and molecular clocks of luxS and the...
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