BERKELEY, Calif., Oct. 9 -- A team led by Alexander Pines and David Wemmer, working with colleagues at the Scripps Research Institute in La Jolla, have developed a sensitive and versatile new biological sensor based on nuclear magnetic resonance (NMR). Pines and Wemmer are members of Berkeley Lab's Materials Sciences Division and Physical Biosciences Div., respectively; both are professors of chemistry at the University of California at Berkeley. The secret of the new biosensor lies in confining laser-polarized xenon atoms inside specially modified molecular cages. 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