Localization of 17 and fluorescence of RFP in the tumor tissue showing the region of interest after retroorbital iv injections at 10 mg/Kg, at: a 24; b 48; and c 72 h. Post mortem fluorescence of organs after sacrifice at 72 h: d NIR for mouse 1; e NIR for mouse 2; f RFP mouse 1; and, g RFP mouse 2. T = tumor, H = heart, K = kidney, Li = liver, Lu = lung, S = spleen