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Biodistribution of PTX in 4T1 xenograft tumor-bearing BALB/c mice at (A) 4 and (B) 24 h (n = 3). (C) Fluorescent distribution of IR-820 and IR820-maleimide at 2, 8, 24, and 48 h, respectively. (D) Calculated fluorescent efficiencies of IR820-maleimide in the main organs and tumors at 2, 8, 24, and 48 h, respectively.
