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The design of the study. Ninety-six units of whole blood (WB) were separated into three groups according to blood type (32 A, 32 B, 32 O). Before separation and freezing of plasma, WB units of each blood type were divided into two groups: 16 WB units of each blood type were stored at 1 to 6 °C and 16 units of each blood type were kept at 20 to 24°C. For each storage temperature, the effects of four different storage periods (4, 6, 8 and 10 hours) were studied.
