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Immunohistochemical staining of CCR7 in bladder transitional cell carcinoma tissues. (A) Negative staining, indicating no expression of CCR7 (score I). (B) Weak positive staining, indicating low expression levels of CCR7 (score II). (C) Moderate positive staining, indicating moderate expression levels of CCR7 (score III). (D) Strong positive staining, indicating high expression levels of CCR7 (magnification, ×400). CCR7, CC-chemokine receptor 7
