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Retrovirus vector for induced pluripotent stem cell (iPSC) reprogramming. (A) Map of polycistronic retroviral vector. Human fibroblasts two days after infection with polycistronic GFP Oct4/Sox2/Klf4/cMyc; (B) iPSC after four weeks post infection negative for GFP indicating that the transgene is silenced in iPSC clone.
