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Healing process evaluation of skin wound after treatment with different samples. (a) representative digital photos of wound area of mice treated with control, PLLA, 5% PNA, 10% PNA or 20% PNA; (b) the simulated unhealed skin areas of the mice, and (c) the unhealed ratios of the mice after treatment. Data are represented as mean ± SD (n = 6). *P < 0.05, **P < 0.01, ***P < 0.001.
