1. Department
of Physiology and Department of Microbiology, Immunology and Molecular
Genetics, Molecular Biology Institute, University of California at Los Angeles, Los
Angeles, California 90095-7327, United States
2. Department
of Physiology and Biophysics and Center for Biomembrane Systems, University of California at Irvine, Irvine, California 92697-4560, United States