Chloride conducting light activated channel GtACR2 can produce both cessation of firing and generation of action potentials in cortical neurons in response to light.

Malyshev AY, Roshchin MV, Smirnova GR, Dolgikh DA, Balaban PM, Ostrovsky MA
Neurosci Lett. 2017 Feb 15;640:76-80. doi: 10.1016/j.neulet.2017.01.026. Epub 2017 Jan 16. PubMed Article

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