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. 2020 Apr 11;10(4):664. doi: 10.3390/ani10040664

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© 2020 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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Ultrastructures of the organelles in oocytes of tertiary follicles. (A) Ooplasmic aggregate of organelles in the oocyte. (B) Aggregates of vesicles containing electron-dense component in association with mitochondria (mitochondria–vesicle (MV) complexes). (C) Electron micrograph of an immature oocyte with hooded mitochondria (*) in the aggregate of organelles. Aggregates of mitochondria associated with vesicles and lipid droplets. In the immature ooplasm, lipid droplets have less electron-dense and granule-like structures. Hooded mitochondrion matrices possessing well-developed cristae (arrow). (D) Collapsing mitochondrion was observed in the tertiary follicle oocyte. M, mitochondrion.