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VEGFR2 blockade suppresses angiogenesis in xenograft mouse models. A, Immunohistochemical staining of CD31 in PC‐9, H3122, and ABC‐20 xenograft tumors. Scale bars: 100 μm. B, C, Number of CD31‐positive blood vessels in tumors treated with the indicated drugs. Each bar indicates the average number of CD31‐positive blood vessels in 5 fields. Error bars represent standard errors; *P < .005
