Tumours were lysed in RIPA buffer and 500 μg of lysate were used for immunoprecipitation of VEGFR2. The following antibodies were used in this study: rabbit anti-VEGFR2 (55B11, Cell Signalling; 2479), HRP-conjugated anti-phosphotyrosine (4G10®, Millipore; 16-105), goat anti-Albumin (Abcam; ab19194), and HRP-conjugated mouse anti-β-actin (Santa Cruz; sc-47778). For a quantitative analysis the membranes were scanned with a fluorescence scanner and the signal strength was determined by using ImageQuant® software. Full-size images are presented in Supplementary Fig. 10.
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