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Fig. 11. (A) Sagittal section through the transitional area between the ON and the OB of masu salmon. sGnRH-ir cell bodies (arrowheads) are observed. (B) Sagittal section through the OB. sGnRH-ir cell body (arrowhead) is observed in the ventral part of the OB of masu salmon. A bundle of sGnRH-ir fibers (double arrowhead) arises from the sGnRH-ir cell bodies in the OB. (C) Frontal section through the ventral OB of masu salmon. sGnRH-ir cell bodies (arrowheads) and bundles of sGnRH-ir fibers (double arrowheads) are observed. (D) Sagittal section through the transitional area between the OB and the telencephalon of masu salmon. sGnRH-ir cell body (arrowhead) is observed in the most ventral part. (E) Sagittal section through the VT of masu salmon. sGnRH-ir cell bodies (arrowheads) are observed. (F) Frontal section through the VT of masu salmon. sGnRH-ir cell bodies (arrowheads) are observed. (G) Sagittal section through the POA of masu salmon. sGnRH-ir cell bodies (arrowheads) are observed in the nucleus preopticus parvicellularis anterioris (PPa). (H) Frontal section through the POA of masu salmon. sGnRH-ir cell bodies (arrowheads) are observed in the nucleus preopticus magnocellularis, pars magnocellularis (PMm). (I) Sagittal section through the pituitary of masu salmon. sGnRH-ir fibers are observed in the vicinity of GTH cells of the proximal pars distalis of the pituitary. (J) Sagittal section through the MT of masu salmon. cGnRH-II-ir cell bodies (arrowheads) are observed. (K) Frontal section through the MT of masu salmon. cGnRH-II-ir cell body (arrowhead) is observed in the nMLF. (L) Sagittal section through the pituitary of masu salmon. No cGnRH-II-ir fibers are observed. Bars indicate 100 μm. Reprinted with permission of John Wiley & Sons, Inc. from Journal of Comparative Neurology, 314, Amano et al., Immunocytochemical demonstration of salmon GnRH and chicken GnRH-II in the brain of masu salmon, Oncorhynchus masou, 587–597, © 1991, Wiley-Liss, Inc., a Wiley Company.

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