For years, doctors have warned patients to finish their antibiotic prescriptions or risk a renewed infection by a "superbug" that can mount a more powerful defense against the same drug. But a new study by Boston University biomedical engineers indicates that treating bacteria with levels of antibiotics insufficient to kill them produces germs that are cross-resistant to a wide range of antibiotics. In the Feb. 12 issue of Molecular Cell, research led by Boston University Professor James J. Collins details for the first time the biomolecular process that produces superbugs... 
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