*'''[[optogenetic]] excitation''' - A light activated excitatory protein is expressed in select cells. [[Channelrhodopsin]]-2 (ChR2), a light activated cation channel, was the first bacterial opsin shown to excite neurons in response to light,<ref>Zhang, Wang, Boyden, and Deisseroth. "Channelrhodopsin-2 and optical control of excitable cells." Nature Methods. VOL.3 NO.10. OCTOBER 2006</ref> though a number of new excitatory optogenetic tools have now been generated by improving and imparting novel properties to ChR2<ref>Gradinaru et al. "Molecular and Cellular Approaches for Diversifying and Extending Optogenetics." Cell. 2010. doi:10.1016/j.cell.2010.02.037</ref> | *'''[[optogenetic]] excitation''' - A light activated excitatory protein is expressed in select cells. [[Channelrhodopsin]]-2 (ChR2), a light activated cation channel, was the first bacterial opsin shown to excite neurons in response to light,<ref>Zhang, Wang, Boyden, and Deisseroth. "Channelrhodopsin-2 and optical control of excitable cells." Nature Methods. VOL.3 NO.10. OCTOBER 2006</ref> though a number of new excitatory optogenetic tools have now been generated by improving and imparting novel properties to ChR2<ref>Gradinaru et al. "Molecular and Cellular Approaches for Diversifying and Extending Optogenetics." Cell. 2010. doi:10.1016/j.cell.2010.02.037</ref> |