HAYWARD, Calif., March 1 -- Researchers at the Max Planck Institute for Biophysical Chemistry in Goettingen, Germany, have used a new nano-sized imaging tool to capture the first-ever movies of cells transmitting the messages that control genes. The breakthrough is expected to help pharmaceutical companies speed and enhance the process of screening candidate cancer drugs. In a study published in the February issue of the journal Nature Biotechnology, the researchers reported they used quantum dots developed and manufactured by Hayward-based Quantum Dot Corp. 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