MS Family Trees (IMAGE) University of British Columbia Caption The family trees of the two families with the MS-causing mutation. "M"=individuals with the mutation. Black circles=individuals with MS and age of disease onset. Gray circles or squares=individuals with the mutation whose health is unknown. Credit Carles Vilarino-Guell/University of British Columbia 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.