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Fluorescence optical images of the mice after retro-orbital injection of 2 μmol/kg of prodrug: (a) Pc-(L-CA4)2 in polymer micelles, (b) Pc-(NCL-CA4)2 in polymer micelles, (c) Pc-(L-CA4)2 in 5% Cremophor solution, and (d) Pc-(NCL-CA4)2 in 5% Cremophor solution. BG: background image before prodrug injection. Scale bar unit: fluorescence arbitrary unit.
