Figure 1: The Genetically Modified Mice (image) University of Tokyo Share Print E-Mail Caption The genetically modified mice shown in this photo demonstrated shorter sleep hours compared to normal mice without genetic modification. Credit Copyright Ueda lab. Usage Restrictions For purposes related to reporting of the current research. Share Print E-Mail 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.