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Relative expression of EcoMLV and EndoPP in re-cultivated cells from the CDX. Expression levels were analyzed by qRT-PCR with probe systems specific for EcoMLV and EndoPP. (A) The relative expression of EcoMLV in re-cultivated cells decreased gradually; down to zero at passage 5. (B) The relative expression of EndoPP in re-cultivated cells shows a similar gradual decrease; at passage 7, one sample gave a borderline signal.
