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Figure S1 Purity and specificity of the RNA retrieved from paraffin-embedded tissue sections. RT-PCR analysis of the expression of E-cadherin (marker of cells of epithelial origin) and VEGFR2 (endothelial cell marker) in the RNA prepared from the endothelial cell fraction and from the tumor cell fraction. Controls were human dermal microvascular endothelial cells (HDMEC), from the University of Michigan Head and Neck Squamous Cell Carcinoma cell line (UM-SCC-11A), and a human cervical cancer cell line (HeLa).

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