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Figure Caption
Fig. 3 Gonadal histology of sexually differentiating zebrafish. A: Early ovary containing only immature stage I oocytes of the perinucleolar stage (arrows). B: Early ovary undergoing transition to testicular tissue, with degenerating oocytes (arrows) and spermatogonial cysts (double arrow). C: Progressed ovary with perinucleolar (arrows) and cortical alveolar (double arrows) oocytes. D: Testis. Scale bar = 50 μm.
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