Channelrhodopsins (ChRs) are light-activated ion channels (Nagel et al., 2003; Nagel et al., 2002). Many of them are found in algae with flagella and eyespot (Rozenberg et al., 2020), where they are ...

Channelrhodopsin-2 (ChR2) has quickly gained popularity as a powerful tool for eliciting genetically targeted neuronal activation. However, little has been reported on the response kinetics of ...