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. 2021 Feb 3;11:2946. doi: 10.1038/s41598-021-82369-z

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© The Author(s) 2021

Open Access This 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/.

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Arrangement of cytopharynx and cell structures of Apiculatamorpha spiralis, clone PhF-6, including trichocysts. (a) section of the anterior cell end with cytopharynx; (b, c) cytopharynx and accociated structures; (d) Golgi apparatus; (e, f) mitochondria and kinetoplasts; (g) trichocysts and crystalloid structure; (h) food vacuole; (i) longitudinal section of the trichocysts; (j, k) empty envelopes of the trichocysts after discharging; (l) crystalloid structure and mitochondria; (m) symbiotic bacterium and crystalloid structure. cl clamp, cmt cytopharynx associated additional microtubules, ct crystalloid structure, cp cytopharynx, dc discoid cristae, fv food vacuole, ga Golgi apparatus, kp kinetoplast, mt mitochondrion, mp microtubular prism, R2 microtubular root R2, R3 microtubular root R3, rs reserve substance, sm subpellicular microtubules, sb symbiotic bacterium, sc scales, tc trichocyst. Scales: (a) 0.5, (b,c) 0.2, (d–f) 0.5, (g,h) 1, (i–k) 0.5, (l) 1, (m) 0.5 μm.