Fig. 4From: Novel CD44-targeting and pH/redox-dual-stimuli-responsive core–shell nanoparticles loading triptolide combats breast cancer growth and lung metastasisRepresentative images of Annexin V-FITC and PI staining of MDA-MB-231 (a) and MCF-7 (c) cells treated with TPL/NPs (20 nM) for 24 h. Quantification results of TPL/NPs after apoptosis induction in MDA-MB-231 (b) and MCF-7 (d) cellsBack to article page