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Passage of cells infected with RCASBP-M2C(4070A)Puro and RCASBP-M2C(797-8)Puro. Infection was initiated by transfection. Cells were passaged, and the virus was titered at each passage (see Materials and Methods). The lower titer of the RCASBP-M2C(4070A)Puro virus was a result of death of the cells infected with this virus.
