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The testis ultra-structure of 2nCC and 3nCC. (A) and (B), the mature testis of 2nCC. (C) and (D), the mature testis of 3nCC, the vacuoles (arrow) are indicated. Bar in part A and C, 2 μm; in part B and D, 0.5 μm. All the mature spermatozoa in the testis of 2nCC and 3nCC had normal structures, indicated that 2nCC and 3nCC were also fertile. In the testis of 3nCC there were certain amounts of vacuoles in the head of the spermatozoa.
