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Retention of hNIS transgene following viral kinetics analysis and serial passage. (a and b) Vero E6 cells were infected with rMERS-CoV/hNIS (a) or parental rMERS-CoV (b) at an MOI of 0.01 or 3 and then collected at 96 h postinfection for RT-PCR. (c) Retention of the hNIS gene following serial passage. RNA was extracted from cells 72 h postinfection followed by RT-PCR at passage 6. A positive-control virus (C+) and uninfected negative-control cells (C−) were used as controls.
