| 21. | The protein that does this is called a repressor.
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| 22. | TGIF is a potential repressor of TGF-? pathways in myometrial cells.
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| 23. | The KRAB domain presents one of the strongest repressors in the human genome.
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| 24. | Expression of the ethA gene is controlled by ethR, a transcriptional repressor.
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| 25. | You'd need repressors, or promotors and a generally complex system.
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| 26. | Tyrosine can also be inhibited at the transcriptional level by the TyrR repressor.
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| 27. | Synthesis of mRNA is blocked when the repressor is bound to the operator.
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| 28. | MiR-200 targets the E-cadherin transcriptional repressors ZEB1 and ZEB2.
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| 29. | In their wider meaning, operator sites are sites for repressors or activators.
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| 30. | Transcription of the SOS response genes is negatively regulated by the LexA repressor.
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