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. 2012 Nov 23;2(6):e001624. doi: 10.1136/bmjopen-2012-001624

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Representative sections from adenocarcinoma samples with no staining (A), weak staining (B) and moderate staining (C) and a squamous cell carcinoma sample with strong staining (D). Endothelial cell staining served as an internal positive control, as seen in the upper left corner of (A).