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HSV‐tk expression in parental and infected A549 cells. The HSV‐tk of the SET and HRE–SET groups and glyceraldehyde‐3‐phosphate dehydrogenase (GAPDH)‐specific transcripts are shown. Lane 1, untreated infected cells at normoxia; lane 2, infected cells under hypoxia (1%); lanes 3–4, infected cells exposed to 2 Gy radiation with or without hypoxia (1%), respectively.
