This paper describes a cool vector, that is termed pEpi “A Vector Based on the Chicken Hypersensitive Site 4 Insulator Element Replicates Episomally in Mammalian Cells” and later lead to this paper “Genetically modified pigs produced with a nonviral episomal vector”
Cloning vector pEPI-1, complete sequence , GenBank: KY499148.1
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