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. 2019 Jan 31;18:21. doi: 10.1186/s12934-019-1061-9

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© The Author(s) 2019

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. 3 — Ultrathin biopsy transmission electron microscopy analysis of recombinant LAB. a Recombinant r-L. lactis-OptiVP2-RCK cells were processed for ultrathin biopsy transmission electron microscopy analysis. No protein particles were observed in cell plasma. b The same process was performed for wt-L. lactis. No protein particles were observed (a, b bar = 200 nm)