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Heterogeneous expression of VEGFR2 in melanoma and colorectal cancer. Dual immunofluorescent staining for VEGFR2 (red) and CD31 (green) in human cancer specimens shows VEGFR2 negative blood vessels (arrows) and VEGFR2 positive blood vessels (asterisks). (A-C) Metastatic malignant melanoma and (D-F) colorectal carcinoma have been divided into their respective channels (overlaid; green; red images). Scale bar = 50 μm.
