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In vivo fluorescence images of U-87 MG tumor-bearing mice before and after intravenous injection of Cy5.5-iRGDC-BK01 and Cy5.5-iRGDC (50 μM). Blue and red circles indicate the tumor and the normal thigh regions nearby the tumor, respectively. The scales of the fluorescence intensity were adjusted to make maximum-to-minimum ratios of average tumor intensity the same.
