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. 2017 Jul 14;48:39. doi: 10.1186/s13567-017-0443-4

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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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Characteristics of AgI/II proteins present in different streptococci. The leader peptide signal (LP), N-terminal domain (N-term), alanine-rich region (A), variable region (V), proline-rich region (P), and C-terminal domain, and the cell wall anchorage domain (CWA) containing the LPXTG domain are illustrated for the S. suis AgI/II, S. pyogenes AspA, S. mutans SpaP, and S. gordonii SspA and SspB. Amino acid (aa) size and percentage of S. suis AgI/II protein identity are also indicated. Black arrows indicate the location of primers pET151_S2agI/IIΔCWA_F and pET151_S2agI/II _{_}ΔLPXTG_R, which were used to produce the his-tagged recombinant AgI/II protein, rAgI/II.