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Ex vivo fluorescence images of excised rat prostate tumors from animals sacrificed 24 h after intravenous dosing (3.0 mg/kg) with deep-red CyAL-5 dye, probe 12, or probe 13 (A). Mean pixel intensities for the tumors normalized to the value for CyAL-5 (B). Error bars are standard error of the mean. N = 4, **P ≤ 0.01, ***P ≤ 0.001. Length scale bar = 1 cm.
