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Maj. Matt Tucker, 33rd Fighter Wing F-35A pilot, smiles during his a peripheral blood stem cell (PBSC) donation at Georgetown University Hospital, Washington D.C., on July 8th, 2019. For the PBSC donation, a needle is placed in one arm to extract blood which is run through a machine that separates the different components. Stem cells and platelets are stored while red and white blood cells are returned to the donor. (Courtesy photo)
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