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Light micrograph of HE stained sections of testes from young (3 years, left) and old C. jacchus (11 years, right). (A) Scale bar indicates 100 µm. Tubular diameters of young (2–3 years, n = 5) and old (10–12 years, n = 4) C. jacchus. (B) Tubular diameter was slightly increased in the old C. jacchus (**** p < 0.0001; unpaired t-test); individual diameters are shown, and bars indicate the mean and SD.
