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Fig. 1.

Fig. 1. From: A transcription switch toggled by noncoding RNAs.

Model for control of the two states of FLO11 transcription by ncRNAs. When transcription of the ncRNA PWR1 is repressed by Sfl1 (Upper), ICR1 is transcribed across the FLO11 regulatory region, thereby repressing FLO11 transcription. When transcription of PWR1 is activated by Flo8 (Lower), the transcription of PWR1 inhibits ICR1 transcription initiation, thereby allowing FLO11 transcription. pFLO11, pPWR1, and pICR1 indicate the relative positions of the three promoters.

Fred Winston. Proc Natl Acad Sci U S A. 2009 October 27;106(43):18049-18050.

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