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Blood vessel density (measured by the expression of CD31) in tissues of burn wound sites as determined by immunochemistry [*p < 0.05, **p < 0.01 vs. control group (4 days); #p < 0.05, ##p < 0.01 vs. control group (10 days); +p < 0.05, ++p < 0.01 vs. control group (17 days)].
