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Selective binding of Stat3 to the C/EBPδ APRE. Nuclear extracts from control or IL-6-treated HepG2 cells were analyzed by EMSA using the wild-type or mutant C/EBPδ APRE probes and control antiserum or Stat1- or Stat3-specific antibody (Ab), as indicated. The film was overexposed to emphasize the supershift signal.
