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Fig. 26. (A) Plasma testosterone (ng/ml), (B) the number of neurons expressing sGnRH mRNA in the POA, and (C) the number of neurons expressing sGnRH mRNA in the VT of castrated precocious male masu salmon reared under short and long photoperiods (mean ± SEM). **(P < 0.01) indicates statistical significance. Reprinted from General and Comparative Endocrinology, 115, Amano et al., Effects of photoperiod on salmon GnRH mRNA levels in brain of castrated underyearling precocious male masu salmon, 70–75, © 1999, Academic Press, with permission from Elsevier.

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