Molars and Premolars (IMAGE) Indiana University Caption This image shows diversity in premolar and molar morphology in Neanderthals, modern humans and potential ancestral species. Credit Aida Gómez-Robles Usage Restrictions Please cite <i>PNAS</i>. 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.