Orangutan Molar (IMAGE) Arizona State University Caption This is a micrograph (x20) of a section through an orangutan first molar showing incremental growth lines in dentine (left) and enamel (right). Credit Gary Schwartz/Arizona State University/Institute of Human Origins 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.