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In previous studies platelets were stored as concentrates. This involved spinning PRP to a platelet pellet, and resuspending the pellet in autologous plasma (Slichter and Harker, 1976a). The several centrifugations involved, however, might prove traumatic to the platelets (causing them to become spherical and stick together). Therefore, in this study platelets were stored as PRP. Platelets were stored at 22ºC, because previous attempts at lower temperatures resulted in low platelet survival. At 22ºC the metabolic rate is less than a body temperature (Murphy and Gardner, 1976), and will, perhaps, enable the platelets to survive longer than in the body. Also, 22°0 is the most feasible in the terms of convenience and economics, because no refrigeration would be needed. Platelets previously had been stored in plastic bags, but there exists a possibility of some plasticizers leaching off into the platelets during. storage, affecting the quality of the platelets, and the potential effects following transfusion into patients (Murphy and Gardner, 1975 and Kim, et al., 1975). Consequently, in this study, platelets were stored. in glass tubes.