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. 2021 May 17;11(5):1430. doi: 10.3390/ani11051430

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© 2021 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 (https://creativecommons.org/licenses/by/4.0/).

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Morphological and histological analysis of the testes tissues of young (Piglet-D30) and sexually mature (Adult-D210) boars. Different magnifications of young boar testis tissues (A,B). The seminiferous tubule structure is formed, the lumina are in an atresia state, and it contains only one type of germ cell, namely the spermatogonia. Bars = 100 μm and 50 μm. Different magnifications of mature boar testis tissues (C,D). The seminiferous tubules have clear lumina and contain germ cells at different periods. Bars = 100 μm and 50 μm. ▲ Seminiferous tubule; ▼ interstitial cells; ◆ spermatogonia cells; ◇ sustentacular cells; ☆ sperm.