Sterol Composition (IMAGE) Chalmers University of Technology Caption This image shows sterol composition in two thermotolerant yeast strains (M7 and TT11) and the original strain (WT), and the 3-D structures of fecosterol and ergosterol. In the thermotolerant strains, fecosterol is the most abundant sterol. Credit Martina Butorac 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.