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Molecular structures of nanoparticles and polymers, and schematic of fluorophore displacement cell detection array. (A) Molecular structures of the cationic gold nanoparticles (NP1-NP3) and the fluorescent polymer (PPECO2). (B) Displacement of quenched fluorescent polymer (dark green strips, fluorescence off; light green strips, fluorescence on) by cell (in blue) with concomitant restoration of fluorescence.
