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Interferon (IFN)-α-activated Stat1 homodimers and Stat1-2 heterodimers bind to GAS elements, whereas the transcription factor ISGF3, which contains Stat1, Stat2 and p48, binds to ISREs. We now find that Stat1-2 dimers can form heterotetramers on tandem GAS sites and that the heterotetramers have a much higher binding affinity for a double GAS site than do heterodimers for a single site, suggesting...
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