sentences:  She was the principal investigator for the space shuttle flight experiment, Fungal Pathogenesis, Tumorigenesis, and Effects of Host Immunity in Space (FIT), which flew on STS-121 on July 4, 2006.She was later promoted to the spot of Chief Scientist for Astrobionics at the NASA Ames Research Center.Her research at NASA has involved studying immune system changes during spaceflight and the effects of radiation and altered gravity on living systems.