Disease Simulation (image) Columbia University Medical Center Share Print E-Mail Caption The simulation of how a patient with an ATG6A genetic defect sees is shown. Credit Courtesy of the Laboratory of Stephen Tsang/ Columbia University Medical Center. Usage Restrictions None Share Print E-Mail 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.