Main image (IMAGE) University of Pennsylvania Caption Sarah Tishkoff Of the University of Pennsylvania led a collaborative team of researchers who have discovered key insights into the molecular basis of skin color differences among Africans. “There’s so much genetic diversity in African populations, but they’ve also been historically underrepresented in studies,” Tishkoff says. “Our findings offer more information on these populations and paint a clearer picture of human evolution.” Pictured here: Two Koesan-speaking men pose for a photograph. Credit Sarah Tishkoff Usage Restrictions Seek permission for reuse from author, Tishkoff 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.