Opsin 3 Tunes Skin Color (IMAGE) Brown University Caption A team of Brown University researchers found that opsin 3 -- a protein closely related to rhodopsin, the protein that enables low-light vision -- adjusts the amount of pigment produced in human skin in response to ultraviolet rays. Credit Image by the Oancea lab Usage Restrictions None License Licensed 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.