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CXCR7 promotes tumor angiogenesis and cell proliferation. (a, c) Immnohistochemistry staining for VEGFA and Ki67 in tumor tissues from mice with subcutaneous HCC implantation. Five tumor implants were analyzed per condition (magnification × 200; scale bars, 100 μm). (b, d) Regulation of serum VEGFA levels by CXCR7 expression were evaluated by ELISA
