Silencer (DNA)
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In genetics a silencer is a DNA sequence capable of binding transcription regulation factors termed repressors. Upon binding, RNA polymerase is prevented from initiating transcription thus decreasing or fully suppressing RNA synthesis.
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Promoter (Pribnow box, TATA box) - Operon (Lac operon, Trp operon) - Terminator
Enhancer - Repressor (Lac repressor, Trp repressor) - Silencer