Fig. 2From: Hypoxia-cleavable and specific targeted nanomedicine delivers epigenetic drugs for enhanced treatment of breast cancer and bone metastasisSynthesis and characterization of hypoxia-cleavable active targeted nanoparticles. (A) Schematic diagram of different nanoparticle structures. (B) UV‒Vis spectra of DSPE-Azo-mPEG5000 before and after hypoxic treatment. (C) The hydrodynamic diameters of NP, RNP, mRNP and ARNP. (D) The average zeta potentials of NP, RNP, mRNP and ARNP. (E) TEM images of NP, RNP, mRNP and ARNP. All data are presented as the mean ± SD (n = 3)Back to article page