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Histochemical analysis of neutrophil filtration within the wounded area on day 3. (a) Arrow indicates the expression of neutrophil infiltration (dark brown color). (b) The means ± SEM of numbers of infiltrating neutrophils per 0.25 mm2 on day 3 in the W-NSS, W-AE, W-Coll, and W-Coll-AE groups.
