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MODEL RELEASED. Blood processing. Technician setting up the automated extraction of plasma from donated blood. After separation, this fluid blood component is frozen and stored. Plasma contains nutrients, salts and various proteins. These include antibodies to help in the fight against disease-causing micro-organisms and proteins that are involved in blood clotting. Plasma is used to treat haemophilia and other bleeding disorders. (KEYSTONE/SCIENCE PHOTO LIBRARY/TEK IMAGE)