1. Research Institute for Children, Children's Hospital, New Orleans, LA 70118; and Department of Pediatrics and Department of Genetics, Louisiana State University Health Sciences Center, New Orleans, LA 70112.
2. Present address: Section of Endocrinology, School of Medicine, University of Chicago, Chicago, IL 60637.
3. Department of Microbiology, Immunology, and Parasitology, Louisiana State University Health Sciences Center, New Orleans, LA 70112.