Illustration of lamodulin sensor (IMAGE) Penn State Caption The protein lanmodulin has been developed into a sensor to identify the rare earth element terbium from complex environments, such as acid mine drainage. The sensor, illustrated here, emits green light when bound to terbium. Credit Emily Featherston, Penn State Usage Restrictions Credit must be given to the creator. License CC BY 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.