Fig. 4. Biodistribution of 1,1′-dioctadecyl-3,3,3′,3′-tetramethylindotricarbocyanine iodide (DIR)-labeled formulations after intravenous (iv) injection in mice.

a Real-time in vivo fluorescence images of mice after iv injection of free DIR, DIR labeled acetylthevetin B (ATB) solution (DIR-ATB), DIR-labeled CP1(DIR-ATB-CP1), and DIR-labeled CP2 (DIR-ATB-CP2) (lex = 745 nm; lem = 800 nm).