CORVALLIS, Ore., Jan. 13 -- Biochemists have "rediscovered" and characterized an important type of chemical bond -- the "halogen bond" -- that once formed the basis for a Nobel Prize but has been largely ignored for decades and never explored for its potential value in medical or pharmaceutical research. They could open the door for new, more effective approaches to drug development, advances in nanotechnology or understanding the possible biological effects of some chemicals to which humans are commonly exposed. 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