Human Mesenchymal Stems (IMAGE) University of Bristol Caption Human mesenchymal stems exhibit green fluorescence after being 'painted' by the designer protein. Credit University of Bristol Usage Restrictions The image is for single use only, should be credited and should not be archived 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.