The EXpedite the PRocessing of Experiments to Space Station (EXPRESS) Rack is a Space Station International Standard Payload Rack (ISPR) being flown on MSL-1 as a precursor payload. The Spacelab program provides the structure and subsystem hardware to accommodate the EXPRESS Rack with interfaces like those on Space Station. Flown on STS-95 aboard the Microgravity Science Laboratory (MSL-1)