<ul><li>Cellular immunity and digestion were the main research topics on Wednesday as the Expedition 72 crew explored space biology aboard the International Space Station.</li><li>NASA Flight Engineer Nick Hague collected blood and saliva samples for the Immunity Assay investigation, aiming to understand space-caused cellular stress and tissue damage.</li><li>NASA Flight Engineers Don Pettit and Butch Wilmore performed spacesuit maintenance, cleaning water cooling loops and checking the communications system.</li><li>The Roscosmos Progress 91 cargo craft is scheduled to dock to Zvezda’s aft port, delivering three tons of food, fuel, and supplies to the Expedition 72 crew.</li></ul>

Crew Explores Cellular Immunity, Digestion and Waits for Cargo Mission

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