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. Author manuscript; available in PMC: 2020 Sep 1.
Published in final edited form as: Methods. 2019 Apr 30;167:3–14. doi: 10.1016/j.ymeth.2019.04.018

Fig. 1.

Fig. 1

Schematic of an indicator displacement assay. In this example, optical signal intensity is low when the indicator is bound to the receptor and high when the indicator is free in solution.