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The hypoxia-inducible factor (HIF) activates transcription via binding to the highly variable hypoxia-responsive elements (HREs). All hypoxia-inducible constructs described to date utilize multimers of naturally occurring HREs. Here, we describe the rational design of minimal hypoxia-inducible enhancers, conceptually equivalent to using an optimized HIF-binding site (HBS) as the building block. Optimizations...
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