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Ants, bacteria wage 50-million-year-old battle for food

A UW-Madison researcher has discovered a startling relationship between a breed of ants and the fungus from which the ants derive nutrients. The ants produce chemicals that protect the fungus from bacterial parasites. As the bacteria evolve to survive the pesticides, the ants evolve new pesticides against the bacteria, in a 50-million-year-old chemical arms race that could one day help humans design more precise antibiotics.