Twin Spine Study (IMAGE) University of Alberta Caption High degrees of similarities in disc degeneration were noted between twin siblings, often despite high discordance in lifetime physical loading exposures. Credit In part from Spine, Battié et al 2004[55]. Usage Restrictions Must be used with accompanying caption & credit. 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.