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White light emission observed from a duplex DNA doubly labeled with both ethynyl pyrene and Nile Red (dsDNA3; right vial image; λex=380 nm). Single stranded DNA3 (ssDNA3) which was also doubly-labeled yielded a red fluorescence as seen in middle vial image. DNA1 and DNA 2 are respectively labeled with either pyrene or Nile Red only. Reprinted with permission from ref 273. Copyright 2009 Wiley-VCH Verlag GmbH & Co. KGaA.
