Stem-Cell Carrying Microsphere (IMAGE) University of Nottingham Caption A close-up of a injectable stem-cell carrying microsphere made of calcium phosphate which are injected to prevent and treat fractures caused by bone-thinning diseases. Credit Ifty Ahmed; University of Nottingham Usage Restrictions None 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.