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Whole body fluorescence images of representative BALB/c mice implanted with 4T1 tumors on the shoulder with HPPH or its peptide conjugate 7 at variable time points with a therapeutic dose (0.3 μmol kg−1, λex = 665 nm; λem = 710 nm). (A): 2h post injection (p.i.); (B): 24h p.i. (C). Average Fluorescent Intensity (AFU) of 3 mice+/− SD of a ROI (20 mm diameter) over the tumor in AU, arbitrary units
