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. 2020 Aug 17;216(2):585–597. doi: 10.1534/genetics.120.303474

Figure 5.

Figure 5

Histological parameters suggest that increased postmeiotic capacity drives age-dependent fertility. We counted the percentage of seminiferous tubules containing (A) round spermatids (PCT_ROUND) and (B) condensing spermatids (PCT_CONDENSING). PCT_CONDENSING increased in the transiently fertile PWKB6 (gray with black border) and PWKAJ (yellow with black border) males at 20 weeks of age. (C) Since round spermatids are precursors of condensing spermatids, PCT_ROUND was correlated with PCT_CONDENSING. However, 20-week-old PWKB6 (gray diamonds with black border) and PWKAJ (yellow diamonds with black border) did not show the same linear relationship as the infertile MD hybrids (all other points). The higher ratio of PCT_CONDENSING to PCT_ROUND suggests that increased postmeiotic capacity is associated with transient fertility.