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. Author manuscript; available in PMC: 2015 Apr 1.
Published in final edited form as: Methods. 2013 Jun 20;66(3):433–440. doi: 10.1016/j.ymeth.2013.06.012

Fig. 1. Components of the Q regulatory system.

Fig. 1

(A) The transcription factor QF activates QUAS-regulated genes to produce reporter or effector proteins (indicated by X). (B) QF activity is blocked by the repressor QS. (C) QS repression of the QF/QUAS interaction is alleviated by addition of quinic acid (QA). P1 and P2 represent promoter/enhancer sequences for QF and QS transcription.