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. Author manuscript; available in PMC: 2017 Sep 23.
Published in final edited form as: Chem Rev. 2015 Nov 9;115(22):12546–12629. doi: 10.1021/acs.chemrev.5b00434

Figure 10.

Figure 10

Schematic representation of FQ-based probe with chemically deactivatable quencher. First, enzymatic hydrolysis of the substrate turns on the fluorescence in FQ probes enabling protease activity to be detected. Next, treatment with an appropriate chemical reagent deactivates the quencher thus allowing detection of inactivated probes.88