halorhodopsin
Protein DomainHalorhodopsin (NpHR) is a microbial rhodopsin optogenetic tool described as a hyperpolarizing light-driven chloride ion pump. It is used for optical silencing and artificial modulation of neuronal activity, and has been combined with channelrhodopsin-2 (ChR2) for multimodal remote control of neurons in culture, tissue, and living animals.