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. 2019 Mar 14;9:4466. doi: 10.1038/s41598-019-41084-6

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© The Author(s) 2019

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 license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license 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 license, visit http://creativecommons.org/licenses/by/4.0/.

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Acanthamoeba quina cysts architecture under scanning and transmission electron microscopy. (A–D) Shape and size variability in SEM. Ostioles with circular or polygonal pronounced edges (arrowheads, B–D) are covered by convex opercula (arrows, B–D). Distinct venation (double arrowheads, B–D) is typical with mostly three wrinkles joined in one point. (E–J) Cross section of cyst in TEM. (E) Mature cyst showing ectocyst (ec) and endocyst (en) separated by inter-cystic space (ics) with deposited scattered fibrillar elements. Endocyst is separated from the cytoplasmic membrane of cell by an electron-transparent space (arrow). Dense cytoplasm contains cortically localised lipid droplets (arrowheads) and round mitochondria with peripheral electron-dense bodies (white arrowheads). (F) Detail of the cross section of mature cyst. The ectocyst (ec) and endocyst (en) are separated by inter-cystic space containing deposited scattered fibrillar elements (fe). Cytoplasmic membrane of the cell forms numerous invaginations (inv). In the cytoplasm, lipid droplets (lip) and spherical mitochondria (m) are visible. (G) Cyst wall architecture with stratified ectocyst (ec), scattered fibrillar elements (fe) deposited in inter-cystic space (ics), and loosen fibrillar structure of endocyst (en) separated from the cytoplasmic membrane (arrowhead). (H) Electron-transparent space is separating endocyst (en) from the cytoplasmic membrane (arrowhead) which is covered by a pale amorphous layer (arrow). (I,J) Details of mitochondria in the dense cyst cytoplasm. Internal electron-dense body is indicated by arrowhead. Bars: (A–D) 10 μm; (E) 2 μm; (F) 500 nm; (G–J) 200 nm.