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The expression of CXCR4 and MMP9 (× 200). A. Negative expression of CXCR4 protein. B. Moderate positive expression of CXCR4 protein. C. Strong positive expression of CXCR4 protein. D. Negative expression of MMP9 protein. E. Moderate positive expression of MMP9 protein. F. Strong positive expression of MMP9 protein.
