Well in theory this would be why https://www.nature.com/articles/s41467-020-17836-8 That protein if and it's a big if that's what the number means if it can be controlled with light then the light could control your neurons. I am not sure if it can be controlled with light but there are some that can be. Worth investigating at least if any florescent proteins were in the shots.

Well in theory this would be why https://www.nature.com/articles/s41467-020-17836-8 That protein if and it's a big if that's what the number mean can be controlled with optogenetics