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(A,B) Cell viability of 4T1 and MCF-7 cells incubated with different concentrations of PPID-NPs under normoxia environment (A) and hypoxia environment (B) (*p < 0.05, compared with the 0.075 mg/mL nanoparticles concentration group). (C,D) Cell viability of 4T1 and MCF-7 cells under different treatments in normoxia environment (C) and hypoxia environment (D) (*p < 0.05, compared with the control group).
