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. Author manuscript; available in PMC: 2014 Oct 30.
Published in final edited form as: J Am Chem Soc. 2013 Oct 16;135(43):16030–16033. doi: 10.1021/ja4082414

Figure 3.

Figure 3

Differential binding of red fluorescently-labeled PEG-PEI, PEG-NMe3+and PEG-PEI-Ace particles to A549 cells in vitro. PEG-PEI (a) but not PEG-NMe3+ (b) or PEG-PEI-ace (c) particles are observed to bind to A549 cells (blue – dapi stained nuclei) via fluorescent miscroscopy. Particle binding is confirmed by flow cytometry (d). PEG-PEI (red), PEG-NMe3+ (blue), PEG-PEI-ace (green) and cells only (black).