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Donor blood processing. Haematologist hanging blood bags containing donated blood, which is being separated into its component parts. The blood will then have its blood type determined and undergo screening for blood-borne diseases before being used in transfusions. Blood transfusions are used to treat various blood disorders and to treat blood loss during surgery or after an accident. Photographed at the Etablissement Francais du Sang, Lille, France. (KEYSTONE/SCIENCE PHOTO LIBRARY/VO TRUNG DUNG/LOOK AT SCIENCES)