Light-powered yeast cells (IMAGE) Georgia Institute of Technology Caption Green rhodopsin proteins inside the blue cell walls help these yeast grow faster when exposed to light. Credit Anthony Burnetti, Georgia Institute of Technology Usage Restrictions Use with credit. License Original content 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.