Trays of Yeast (IMAGE) Syracuse University Caption Wells of yeast in the top tray with only two mutualist species and a cheater showed higher extinction (indicated by the many dark wells). Yeast strains of complex communities and a cheater in the bottom tray showed better growth and less extinction. Credit Syracuse University 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.