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Representative wound closure imaging of animals injected locally or intravenously with exosomesor PBS after sufferring a back wound (2 × 1.5 cm) were collected at indicated time points of Day 1, 5, 7, 14, 21 (A). Untreated and PBS injection severed as control. Quantitative analysis of wound closure at different time points (B). *P < 0.05, **P < 0.01.
