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Schematic illustration of the interaction between the nanoparticles and cell surface in the sensing system generating differential quenching and providing distinct patterns to discern different types/states of cells. The sensing system contains two arrays: |QD|M is the mixture of GQD and RQD; |QD/AuNP|M is the mixture of GQD, RQD, and AuNP. These two arrays are placed in separated wells and each array provides two fluorescence responses.
