Characteristics of C. farreri testes when Cf-Klf4 knockdown for 24 d.
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(a), phenotype; (b), GSI (n = 8); (c), Gamete number in testis follicles of a 2500 μm2 area (n = 5, five sights each individual, respectively); (d), percentage of various types of germ cells in a total number of 200 gametes (n = 5, five sights each individual, respectively). Data are means ± SEM. Different letters indicate significant differences (P < 0.05).