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. Author manuscript; available in PMC: 2011 Sep 1.
Published in final edited form as: Ultrasound Med Biol. 2010 Sep;36(9):1470–1480. doi: 10.1016/j.ultrasmedbio.2010.06.010

Figure 1.

Figure 1

Schematic diagram of microbubbles. Negatively charged plasmid DNA encoding red fluorescent protein (CMV-RFP) was conjugated to cationic microbubbles through electrostatic binding. Polyethylene glycol (PEG) spacers were added to enhance longevity in vivo.