Limb Development and Retinoic Acid (video) Sanford-Burnham Medical Research Institute Loading video... Caption Gregg Duester, Ph.D., talks about new research clarifying the role of retinoic acid in limb development. His research provides new insights into congenital limb defects. Credit Burnham Institute for Medical Research Usage Restrictions None 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.