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The present study obtained a germ cell-specific marker dead end ( dnd ) in olive flounder ( Paralichthys olivaceus ) named  Podnd . The tissue-specific expressions of  Podnd  transcripts were present in testis and ovary but were not detectable in other somatic tissues detected. SISH showed that  Podnd  expressed only in germ cells at different developmental stages but not in surrounding somatic cells. The expression of  Podnd  during embryonic development at 16 different stages revealed that the relative expression of  Podnd  transcript fluctuated at a high level in the cleavage stages, gradually decreased through subsequent development, and reached the lowest at late gastrula stage till it was nearly undetectable. The  Podnd  transcripts localization and migration were similar to zebrafish. Further research on the specification migration mechanism of PGCs and the role of germ cell during gonadal development in olive flounder would improve our understanding of germline development.

ThedndRNA Identifies Germ Cell Origin and Migration in Olive Flounder (Paralichthys olivaceus)