1. Departments of Biochemistry and Physics & Physical Oceanography, Memorial University of Newfoundland, St. John's, Newfoundland, Canada A1B 3X9, Department of Medicine, UCLA School of Medicine, Los Angeles, California 90095, Los Angeles Biomedical Research Institute at Harbor−UCLA Medical Center, Torrance, California 90502, and Department of Pediatrics, Leiden University Medical Center, 2333 ZA Leiden, The Netherlands