Protocols described here allow for the study of the electrical properties of excitable cells in the most non-invasive physiological conditions by employing zebrafish embryos in an in vivo system together with a fluorescence resonance energy transfer (FRET)-based genetically encoded voltage indicator (GEVI) selectively expressed in the cell type of interest.
Benedetti, L., Ghilardi, A., Prosperi, L., Francolini, M., Del Giacco, L. Biosensing Motor Neuron Membrane Potential in Live Zebrafish Embryos. J. Vis. Exp. (124), e55297, doi:10.3791/55297 (2017).