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Estradiol-17β (E2) and maturation-inducing hormone (MIH) are two steroid hormones produced in the teleost ovary that are required for vitellogenic growth and final oocyte maturation and ovulation. During this transition, the main steroid hormone produced in the ovary shifts from estrogens to progestogens. In the commercially important Japanese eel (Anguilla japonica), the MIH 17α,20β-dihydroxy-4-pregnen-3-one...