A: Time courses for turbidity clearance. DMPC alone (a), apoE3 (b), and apoE4 (c). The DMPC and protein concentrations were 0.25 and 0.1 mg/ml, respectively. B: Effect of protein concentration on fraction cleared in 10 min. ApoE3 (●), apoE4 (△), and apo E4(E255A) (○). C: Comparison of DMPC solubilization efficiency. Protein concentration was 0.1 mg/ml. The results from 3–5 independent experiments using different batches of protein are shown.