Tracing the History of ACAN Mutations (IMAGE) Children's National Hospital Caption A family participates in a clinical trial for aggrecan deficiency, tracing the ACAN gene mutation back through four generations. Credit M, the mother in this photo. 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.