This is the revolutionary new tool that's taking neuroscience by storm, and in this case, "opto" means light and "genetic" refers to the fact that these fruit flies have been modified to contain a special gene that makes only certain neurons respond to light.
Es la nueva herramienta revolucionaria que está cautivando a la neurociencia. En este caso, "opto" significa "luz", y "genética" significa que estas moscas se han modificado con un gen especial que hace que solo ciertas neuronas respondan a la luz.