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. Author manuscript; available in PMC: 2009 Jun 11.
Published in final edited form as: Adv Drug Deliv Rev. 2008 Sep 20;60(15):1600–1614. doi: 10.1016/j.addr.2008.08.004

Fig. 3.

Fig. 3

Fluorescence microscopy detection of PPEI-EI-functionalized carbon dots in MCF-7 cells with one-photon (458 nm) and two-photon (800 nm) excitations. Shown in the insets are signals likely associated with single carbon dots.