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