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. 2016 Dec 5;14:80. doi: 10.1186/s12951-016-0233-6

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© The Author(s) 2016

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Fig. 4 — Targeting ability of Cy7-cojugated BP NPs compared to control NPs. Histogram of the difference in fluorescence between day 1 and day 7 of each NP. The fluorescence of the BP NPs remains constant indicating that they are retained in the area of the tumor, whereas the fluorescence of the control NPs is reduced, indicating that they have been cleared from the tumor area (analyzed by ImageJ software). Error bars represent standard deviation