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. 2018 Feb 9;18:170. doi: 10.1186/s12885-018-4074-6

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© The Author(s). 2018

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 — Samples positive for MMTV-env like sequences. A new DNA extraction was performed from all samples that gave a positive PCR result. The PCR reaction was repeated to confirm the results. (N) Stands for negative control