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

•Light activated chloride channel GtACR2 was expressed in vivo in rat pyramidal neurons.•Light stimulation of GtACR2 can induce both inhibition and excitation of cells.•Light-induced generation of action potentials most likely occurs in axonal terminals.•GtACR2 potentially could be used both as cell...

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