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Cellular expression of Cre recombinase in testis of Tg pigs. Testis from Tg and WT pigs were analysed by HE staining (A, B) and IHC (C, D). Brown signals showed the expression of Cre recombinase and nuclei were stained with Hoechst. Cre was detected in the spermatogonia of the seminiferous tubules (red dashed line).
