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In vivo optical imaging of organic semiconducting nanoparticles (OSNs). Ultralong phosphorescence and fluorescence imaging of lymph node in living mice 1 h after the intradermal injection of OSN1-T (1.6 × 10−6 M) into the forepaw of mice. This image has been reproduced with permission from Zhen et al. [94] © 2017, Wiley-VCH.
