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Fig. 2. Timetable of spermatogenesis of hCG injected eel testis. Germ cell development is almost synchronous throughout the testis and the proliferation of spermatogonia, meiosis and spermiogenesis occur at definite times: 3, 12 and 15 days after hCG injection, respectively. Reprinted with permission from Reproduction, 142, Miura et al., Gh is produced by the testis of Japanese eel and stimulates proliferation of spermatogonia, 869–877, Fig. 1, © 2011, Society for Reproduction and Fertility, and reprinted with permission from Kaiyo to Seibutsu, 24, Miura and Miura, The challenge of artificially producing sperm and egg from immature gametes in vitro, 114–119, Fig. 1, © 2002, Seibutsukenkyusha.

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