Triggering Taste Cells with Light (video) California Institute of Technology Share Print E-Mail Loading video... Caption Sour taste cells in these mice have been genetically engineered to be stimulated by light. When the mouse is thirsty, it goes to its water source and finds only light -- which gives it the sensation of water, suggesting that sour cells mediate the water response. Credit Oka laboratory / Caltech Usage Restrictions WITH PROPER CREDIT Share Print E-Mail Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.