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. Author manuscript; available in PMC: 2014 Sep 1.
Published in final edited form as: Wiley Interdiscip Rev Nanomed Nanobiotechnol. 2013 Jul 2;5(5):449–468. doi: 10.1002/wnan.1233

Figure 1.

Figure 1

siRNA faces several barriers during intracellular delivery. Representative biomaterials that are able to overcome these barriers are shown above, along with the particular strategy employed by that material.