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Testicular germ cells of channel catfish, Ictalurus punctatus, and blue catfish, I. furcatus were separated into four layers with Percoll density gradient centrifugation, containing different cell types (40 % in the first layer were spermatogonial stem cells, SSCs). Expression of seventeen genes was analyzed for cells from different layers by real-time quantitative PCR. Pfkfb4, Urod, Plzf, Integrin6...
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