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. 2017 Jun 26;7:137. doi: 10.1186/s13568-017-0432-z

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© The Author(s) 2017

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 — Visual observation of PNA-AuNP colorimetric assay in presence of negative and positive samples. Upper row is negative samples from left to right, 1 mismatched DNA target, 2 deleted DNA target, 3 FMDV, 4 BoHV, 5 P. multocida, 6 E. coli O157:H7, 7 M. bovis, 8 BLV, and 9–11 negative field samples. Lower row is positive samples from left to right, 1 BVDV-NADL; 2 BVDV-2, 3–8 positive field samples, and 9–13 archived isolates