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Fig. 3.( a) Visualising G-quadruplex DNA dynamics in live cells by fluorescence lifetime imaging microscopy.( b) Functionalized CdSe / ZnS quantum dots for intracellular pH measurements by fluorescence lifetime imaging microscopy.( c) A novel quantum dotbased pH probe for long-term fluorescence lifetime imaging microscopy experiments in living cells.( d) High-throughput fluorescence lifetime imaging flow cytometry.