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Association of tumour angiogenesis with ETBR expression. (A) CD31 expression was detected in endothelial cells of tumour vasculature (original magnification, × 200). (B) Immunohistochemistry for D2-40 showing lymphatic channels with staining of endothelium (original magnification, × 200). (C) Microvessel density (MVD) was significantly higher in tissues with high ETBR expression compared with those with low expression.
