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FlicR: A bright and fast red fluorescent protein voltage indicator that reports neuronal activity

Fluorescent-protein-based voltage indicators enable imaging of the electrical activity of many genetically targeted neurons with high spatial and temporal resolution. FlicR is a new bright red fluorescent protein-based voltage indicator that has  sufficient speed and sensitivity to report single action potentials and voltage fluctuations at frequencies up to 100 Hz in single-trial recordings with wide-field microscopy. Because it is excitable with yellow light, FlicR1 can be used in conjunction with blue-light-activated optogenetic actuators.  

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