Rat liver mitochondria were isolated according to [9 (link)] in a buffer containing 250 mM sucrose, 3 mM Tris-HCl (pH 7.3), and 0.5 mM EGTA; subsequent mitochondrial sediment was washed out twice by resuspension-centrifugation in a medium containing 250 mM sucrose and 3 mM Tris-HCl (pH 7.3) and finally suspended in 1 mL of the last buffer. According to Bradford, the mitochondrial protein content assayed was within 50–60 mg/mL.
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