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Lipid fluidity of classes of lipoproteins. VLDL, LDL, and HDL were isolated from fasting plasma by density gradient centrifugation, mixed with nitoxyl spin-labeled stearic acid, and subjected to EPR spectroscopy. A, 2 µmol/l 5-DSA; B, 2 µM 12-DSA; and C, 2 µM 16-DSA.
