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The poor spermatogenesis of this species was characterized by the following findings: First, spermatogenesis was evident in only four samples. Meiosis progressed in two samples, but they lacked spermatogenesis. In the remaining four specimens, seminiferous tubules hyalinized without any sign of spermatogenesis. Second, seminiferous epithelia were thin even in the males in which spermatogenesis was observed. Third, degenerated seminiferous tubules were found in all specimens. Fourth, abnormally large syncytial cells were found in the tubules. Six stages in the epithelial cycle of the seminiferous tubules were identified. Testosterone staining made it clear that there were many Leydig cells with spherical or fusiform nuclei in an abundance of interstitial tissue. The relevance of the testicular architecture of gorillas to the mating system is discussed. Am. J. Primatol. 63:183\u2013199, 2004. \u00a9 2004 Wiley\u2010Liss, Inc.<\/jats:p>","DOI":"10.1002\/ajp.20051","type":"journal-article","created":{"date-parts":[[2004,8,2]],"date-time":"2004-08-02T22:01:22Z","timestamp":1091484082000},"page":"183-199","source":"Crossref","is-referenced-by-count":16,"title":["Testicular histological examination of spermatogenetic activity in captive gorillas (<i>Gorilla 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