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This is an update request for the document Canonical hedgehog signaling augments tumor angiogenesis by induction of VEGF-A in stromal perivascular cells by Weiwei Chen, Tracy Tang, Jeff Eastham-Anderson, Debra Dunlap, Bruno Alicke, Michelle Nannini, Stephen Gould, Robert Yauch, Zora Modrusan, Kelly J. DuPree, Walter C. Darbonne, Greg Plowman, Frederic J. de Sauvage and Christopher A. Callahan

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