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    Marcel Bruchez

    Six years ago, Marcel Bruchez, then a graduate student at the University of California, Berkeley, showed that quantum dots – glowing particles just nanometers wide – could be used to tag proteins inside cells. Within months, Bruchez had cofounded Quantum Dot to market the new imaging tool to biologists and drug developers seeking a more detailed picture of molecular events. It is “one of the first commercial applications of nanotechnology,” says Bruchez.