Normal Infant Mouse Next to Mutant Mouse (IMAGE) University of California - San Diego Caption In this picture a normal infant mouse (at top) is shown next to a mutant mouse, whose skin five times thicker than normal. Credit UCSD 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.