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. 2019 Nov 22;9:17374. doi: 10.1038/s41598-019-53574-8

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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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Ultrastructure of perivitelline space in wild type and hyh MII oocytes. Representative transmission electron microscopy images of perivitelline spaces from wild type (a) and mutant homozygous (hyh) oocytes (b–d). (a) Perivitelline space from wild type MII oocytes is free of extracellular structures, only oolema microvilli are observed. (b–d) Numerous residual bodies are observed in the perivitelline space of mutant homozygous (hyh) MII oocytes, many of them are membrane-delimited. Additionally, remnants of cytoplasmic components as lipid droplets (asterisk) and dense lamellar bodies (arrow) are observed under higher magnification (d). Note phagophore-like structure surrounding a membrane bound vesicle (b, arrowhead). Scale bar: 1 μm.