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Retention of mature spermatids in tubules at stages IX to XI in testes of wild-type (circles) and Tnp2 mutant (triangles) mice. The fractions of tubules with 3 to 15 sperm (A), 1 to 2 sperm (B), and no sperm (C) per cross-section are shown. Asterisks indicate values that are significantly different from those for the wild type (P < 0.05). Error bars indicate standard errors.
