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. 2020 Dec 2;18:187. doi: 10.1186/s12915-020-00916-y

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© The Author(s) 2020

Open AccessThis article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/. 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 in a credit line to the data.

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Fig. 5. — Scanning electron microscopy of the strains CP021 and S13. a Joint flagella during cytotomy in CP021. b Non-dividing cell of S13: the second flagellum is attached only by its tip. c Lateral view of the tip of the second flagellum tightly connected to the first one in S13. d Top view of the second flagellum’s tip in CP021; note the elongated distal part and lateral extensions. e Detaching flagellar tip in S13. f–j Free flagellar tips in CP021 (f–h) and S13 (i, j). White arrowhead—tip of the second flagellum; black arrowhead—lateral extension of the flagellar tip. Scale bars: a, b 10 μm, c–j 1 μm