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Woman sitting in chair giving blood

Steve Holton (left), explains to Wendy Steinhoff how the process of apheresis works. Her whole blood is captured in the middle bag, and then separated into red blood cells in the right bag and plasma into the left bag. At a certain time in the process her red blood cells, along with saline, are pushed back into her vein. (Photo by Eric Pilgrim, Fort Knox Public Affairs.)

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