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Internalization of scaffold-immobilized with exosomes by RAW 264.7 cells. Representative confocal microscopy images of RAW 264.7 cells co-cultured with PCL/PDA (A), PCL/PDA + GSNO (B), PCL/PDA + exosome (C), and PCL/PDA + GSNO + exosome (D). Exosomes were pre-labeled with green fluorescent PKH67 prior to immobilization onto scaffolds. Cells were collected at 4 h and 24 h and stained with Alexa Fluor 594-conjugated phalloidin (red), and DAPI (blue). Scale bars: 100 μm.
