SAPAP3 Knockout Mouse (IMAGE) NIH/National Institute of Mental Health Caption SAPAP3 knockout mouse has a raw bald patch on its face from compulsive grooming behavior. Credit Guoping Feng, Ph.D., Duke 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.