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Immunohistochemical staining of the fibrin and MMP-2 expression in the tumor tissues. (a) The HE staining of tumor tissue. (b, c) Immunohistochemical staining of fibrin and MMP-2 expressions in tumor tissue (brown). Positive expressions of fibrin and MMP-2 were detected in U87 tumor tissues. (magnification: ×200; scale bars, 3 μm).
