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Schematic illustration of surface charge reverse strategy and PPD characterization. (A) Schematic illustration of the surface charge reverse strategy of sEVs by PPD modification for their enhanced cartilage biodistribution; (B) 1H‐NMR (400 M) spectrum of PPD (DMSO‐d6); (C) The cytocompatibility of 100 μg/ml PPD detected by CCK8 assay (n = 6)
