Stem Cell Growth Comparison (IMAGE) University of Texas at El Paso Caption A) Stem cell colonies adhere to and grow on live feeder cells. B) This phenomenon is unaltered when feeder cells are fixed, or dead. Credit Kiralise Silva / UTEP Usage Restrictions Credit Required. 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.