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. 2015 Jun 23;10(6):e0130391. doi: 10.1371/journal.pone.0130391

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© 2015 Zhang et al

This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited.

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Fig 1 — (A) Three His-tagged recombinant proteins were designed to be used as candidate antigens: full length HspA (rHspA), the catalytic domain of GGT (rGGT), and a fusion protein composed of rHspA and rGGT linked by two lysine residues (rHspA-GGT). (B) Recombinant proteins were purified by nickel ion affinity chromatography and gel-filtration chromatography. Recombinant proteins were then analyzed by SDS-PAGE. (C) The schedule for vaccine immunization, determination of cytokines secretion, and antigen-specific antibodies. (D) The schedule for vaccine immunization and analysis of H. pylori colonization.