Tracy Caldwell and Charles Hobaugh, NASA (image) Houston Methodist Caption Animal Enclosure Modules similar to the one shown here, being inspected by Mission Specialist Tracy Caldwell, Ph.D., and Pilot Charles Hobaugh aboard Space Shuttle Endeavor (STS-118), are used to study animals in low gravity conditions. Scientists are reporting mice traveling aboard STS-133 showed evidence of ocular nerve damage and changes in eye gene expression. Credit NASA Usage Restrictions None 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.