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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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Cytoplasmic degradative structures in hyh oocytes. Representative electronmicrographs of MII oocytes from mutant homozygous (hyh) mice showing different degradative structures such as autophagic-like vesicles in different stages of maturation (arrowheads; a–c,e) and dense lamellar bodies (arrows; a,c,d,f). More immature autophagic-like vesicles show a double membrane separated by a wider lumen and its main contents appear to be recognizable cytoplasmic organelles. Meanwhile more mature autophagic-like vesicles are delimited by a single membrane containing membranous material of unrecognizable origin. Note in (c) that a multivesicular body (mvb) and a multilamellar body (arrow) are in close association with an autophagic-like vesicle (arrow head). Mt: mitochondria; ld: lipid droplet; mvb: multivesicular body; mva: multivesicular aggregate; cpl: cytoplasmic lattice; ser: smooth endoplasmic reticulum. Scale bar: 1 μm.