Penn State researchers (IMAGE) Penn State Caption Penn State researchers spent 15 years working with the Kalinago people in the Caribbean to better understand the genetics underpinning skin tone in people without significant European ancestry. Credit Provided by Khai C. Ang Usage Restrictions Credit must be given to the creator. Only noncommercial uses of the work are permitted. No derivatives or adaptations of the work are permitted. License CC BY-NC-ND 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.