1. Departments of Biochemistry and Pharmacology, University of Texas Southwestern Medical Center, Dallas, Texas 75390
2. Departments of Medicine and Biochemistry, Vanderbilt University Medical School, Nashville, Tennessee 37232
3. Department of Pharmacology and Toxicology, Medical College of Wisconsin, Milwaukee, Wisconsin 53226
4. Department of Entomology and Cancer Center, University of California, One Shields Avenue, Davis, California 95616