Mice Fetuses (IMAGE) Penn State Caption Fetuses from zinc-deficient mice in the study were 38 percent smaller on average than those from the control group fed a diet with zinc included. Credit Penn State Usage Restrictions non commercial use only 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.