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. 2016 Aug 12;6:65. doi: 10.1186/s13550-016-0221-8

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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.

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Fig. 3 — PET images of BALB/c nude mice after injection of 3 MBq ⁶⁸Ga-DOTA-exendin-3. PET was acquired 1 h p.i. after euthanasia with an acquisition time of 45 min. High liver uptake is seen when the unpurified tracer is injected (a). Gel filtration partially removed the ⁶⁸Ga-colloid (b), whereas no liver uptake was observed when ⁶⁸Ga-DOTA-exendin-3 was purified by RP-HPLC (c) or SPE (d)