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(a) Representative overlaid brightfield and fluorescence ex vivo images of major organs of BALB/c mice sacrificed 2 h after retro-orbital injection of either ICG (top) or 3 (bottom). Scale is in arbitrary fluorescence units. (b) Biodistribution of ICG and 3 in BALB/c mice. Note that this data does not include the large fraction of probe 3 excreted as urine. *p < 0.1, **p < 0.05, otherwise no statistically significant difference.
