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The effect of ultraviolet A (UVA) radiation on the DNA-binding activity of the transcription factor STAT1 was studied by electromobility shift assay in the human keratinocyte cell line NCTC 2544. The STAT1-binding activity exhibited a biphasic pattern as a function of UVA doses. For UVA doses lower than 0.6 J/cm 2 , a dose-dependent increase in STAT1 activity was observed. In a second phase,...