Body Size (IMAGE) Institute for Research in Biomedicine (IRB Barcelona) Caption Bantam mutant animals (right) show reduced body size as a result of abnormally high steroid hormone levels. Credit © M. Milán lab, IRB Barcelona. Author: Laura Boulan 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.