Stem Cell Debut (IMAGE) Rockefeller University Caption The researchers traced the cell divisions that occur as hair follicles form in mice to determine where stem cells first emerge. Above, developing hair follicles are shown at various stages. Credit The Robin Chemers Neustein Laboratory of Mammalian Cell Biology and Development at The Rockefeller University/<i>Cell</i> Usage Restrictions Image may be used only to illustrate the research described in the accompanying release. 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.