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. 2017 Nov 2;14:36. doi: 10.1186/s12014-017-9171-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. 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. 2 — Indirect ELISA for serum reactivity from animals immunised with a aPPD or b bPPD against bPPD, aPPD and P22. As a negative control, serum was obtained from non-immunised mice (yellow line). The inset shows results obtained at serum dilutions of 1:128. OD optical density