Paul Cooke and Liz Simon, University of Illinois at Urbana-Champaign (image) University of Illinois at Urbana-Champaign Share Print E-Mail Caption Veterinary biosciences professor Paul Cooke and doctoral student Liz Simon led a team that found that spermatagonial stem cells can be directly converted into other cell types. Credit Photo by Diana Yates Usage Restrictions Photo may be used only with stories about the research described in the news release. Please credit: Photo by Diana Yates 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.