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Hybrid nanoparticles possessing simultaneous magnetic and fluorescent properties were fabricated by the covalent attachment of fluorescein isothiocyanate(FITC)onto magnetic polymeric particles(MPPs)of poly(styrene/divinyl benzene/acrylic acid)functionalized by chitosan.The MPPs-chitosan/FITC were successfully used for labeling the living organ and blood-related cancer cells,i.e.,HeLa,Hep G2 and K562 cells.