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. Author manuscript; available in PMC: 2016 Dec 10.
Published in final edited form as: J Control Release. 2015 Sep 1;219:205–214. doi: 10.1016/j.jconrel.2015.08.050

Figure 2.

Figure 2

Schematic diagram showing nanoparticle fluorescence activation in the acidic tumor microenvironment (pH 6.5 – 6.8) and inside the more acidic organelles (pH 5.0 – 6.0). Adapted from Ref [41] with permission from Nature Publishing Group.