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Hidekazu Tsutsui1, Satoshi Karasawa1, 2, Yasushi Okamura3 & Atsushi Miyawaki1
We used two new coral fluorescent proteins as fluorescence resonance energy transfer (FRET) donor and acceptor to develop a voltage sensor, named Mermaid, that displays 40% changes in emission ratio per 100 mV, allowing for direct visualization of electrical activities in cultured excitable cells. Notably, Mermaid has fast on-off kinetics at warm (33°C) temperatures and can report voltage spikes comparable to action potentials.
Nature Methods, Published online: 11 July 2008; | doi:10.1038/nmeth.1235
http://www.nature.com/nmeth/journal/vaop/ncurrent/abs/nmeth.1235.html