(IMAGE) Tokyo Medical and Dental University Caption New study sheds light on the origin and distribution of a specific variant of the CARD9 gene in East Asia. By comparing the CARD9 variants found in a group of Korean and Japanese patients with CARD9 deficiency with those reported in Chinese patients, researchers from Japan revealed that this particular variant stems from a common ancestor that lived less than 4,000 years ago. Credit Department of Child Health and Development, TMDU 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.