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. 2017 Oct 5;15:69. doi: 10.1186/s12951-017-0305-2

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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. 1 — Construct for expression of trimeric Haemagglutinin in plants. H7 was expressed in tobacco leaves under the control of the CaMV 35S promoter. H7 was fused with trimeric motif GCN4-pII to form H7-pII. Recombinant H7 contained His and c-myc tags for affinity chromatography purification and Western blotting, respectively. The LeB4 signal peptide and KDEL motif were used to ensure ER retention. 35S-P: CaMV 35 S promoter; SP: legumin B4 signal peptide; H7: haemagglutinin A/H7N9; GCN4-pII: trimeric motif; His: His-tag; 35S-T: CaMV 35S terminator