Drs. Lei Ding and Sean Morrison, UT Southwestern Medical Center (image) UT Southwestern Medical Center Share Print E-Mail Caption Dr. Sean Morrison (right), along with Dr. Lei Ding, has identified the specific cells responsible for nurturing blood-forming stem cells, research that eventually could help increase the safety and effectiveness of bone-marrow transplantations. Credit UT Southwestern Medical Center Usage Restrictions Credit required 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.