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(A) In vivo fluorescence imaging of the 4T1 tumor-bearing mice at 0, 0.5, 1, 2, 4, 6, 12, 24, and 48 h after intravenous injection of CLN (2.5 μmol/kg). The black cycles indicate the tumor sites. (B) Fluorescence intensities of the tumor sites vs. times (n = 3).
