Laboratory Mouse (IMAGE) Johns Hopkins Medicine Caption A laboratory mouse feeds her newborn pups that are about the size of a quarter and weigh less than an ounce. A Johns Hopkins Medicine-led research team has overcome previous problems working with infant mice to develop a model for studying a devastating gastrointestinal disease that strikes premature babies with anemia. Credit The Jackson Laboratory 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.