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Representative images of phase contrast microscopic observation of TQ-PLGA-PF68 nanoparticles and the encapsulant (Pluronics and PLGA-PEG) cytotoxic effect on the resistant breast cancer cell lines. (A) 2% (w/v) Pluronics F68; (B) 2.5% (w/v) PLGA-PEG; (C) 96.34 µg/mL TQ-PLGA-PF68 nanoparticles. Cells were observed at 100× magnification.
