Corp., Elk Grove Village, IL) was prepared. Treatment for each time point was performed a, room temperature with 50 rng BR in a volume of 10 ml using 0.1% Triton, followed by centrifugation at 200000×g in a Beckman TL-100 ultr:~.centrifuge at 4°C using a TLA 100.3 rotor. For most purposes, centrifugation was for 20 rain. The '0' time point sample was immediately centrifuged for the minimum possible time which, allowing for formation of a vacuum, attaining speed, and stopping, was 7 rain. Optical measurements at 570 nm showed that no liberation of monomer occurred during the treatment, and previous work showed negligible loss of the trimer structure [1]. Lipid extraction of the pellets and supernatant fractions was performed using the method of Bligh and Dyer [7] as described by Kates et al. [8].