Microbial rhodopsins convert light into ion flux; in neurons, this can be used to control activity. New work shows that the opposite is also true: rhodopsins can be used to visualize neural activity.
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Looger, L. Running in reverse: rhodopsins sense voltage. Nat Methods 9, 43–44 (2012). https://doi.org/10.1038/nmeth.1817
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DOI: https://doi.org/10.1038/nmeth.1817