Long-distance relationships really mess up your life, and they don't do much for your biochemistry either. We used to think communication between molecules in solution was impossible unless they were almost close enough to bump into each other. But in fact, a strand of DNA can provoke a reaction in another strand far away—a finding that reveals biochemistry as fiendishly complex. Ions seem to act as the go-between, say Kenneth Breslauer from Rutgers University in New Jersey and his colleagues at the University of Cape Town.
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