BRAIN - Switching off anxiety with light: Cone opsins coupled with serotonin receptors

Receptors for the messenger molecule serotonin can be modified in such a way that they can be activated by light, a study shows. An imbalance in serotonin levels seems to cause anxiety and depression. The researchers have provided a new model system for investigating the mechanism underlying these dysfunctions in cell cultures as well as living organisms ...

http://www.sciencedaily.com/releases/2014/04/140407090411.ht