NASA astronaut Reid Wiseman (IMAGE) NASA/Johnson Space Center Caption NASA astronaut Reid Wiseman inserting human biological samples in the Minus Eighty Laboratory Freezer for ISS (MELFI). Archived data from these samples later were used by researchers studying the effects of space on the immune system. Credit NASA 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.