Jane Johnson and Melanie Cobb (IMAGE) UT Southwestern Medical Center Caption This is Dr. Jane Johnson and Dr. Melanie Cobb. Credit UT Southwestern Medical Center Usage Restrictions UT Southwestern Medical Center 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.