ISS018-E-034074 (20 Feb. 2009) --- Astronaut Sandra Magnus, Expedition 18 flight engineer, works with the LOH- RadGene experiment near the Cell Biology Experiment Facility (CBEF) in the Kibo laboratory of the International Space Station. This experiment investigates alterations in immature immune cells that have been exposed to cosmic radiation. The samples were placed in culture bags and launched to the ISS on the STS-126 mission. After the experiment, frozen samples will be returned to the ground on the STS-119 mission.