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Energy-Looping Nanoparticles: Harnessing Excited-State Absorption for Deep-Tissue ImagingLevy, Elizabeth S.; Tajon, Cheryl A.; Bischof, Thomas S.; Iafrati, Jillian; Fernandez-Bravo, Angel; Garfield, David J.; Chamanzar, Maysamreza; Maharbiz, Michel M.; Sohal, Vikaas S.; Schuck, P. James; Cohen, Bruce E.; Chan, Emory M. · ACS Nano · 2016