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Yasuhisa Kobayashi, Takeshi Usami, Tomoki Sunobe, Hisaya Manabe, Yoshitaka Nagahama, Masaru Nakamura. "Histological Observation of the Urogenital Papillae in the Bi-Directional Sex-Changing Gobiid Fish,Trimma okinawae." Zoological Science (2012) 121-126