1. Genetic Disease Branch, California Department of Health Services, Berkeley, CA 94704.
2. Children's Hospital Oakland Research Institute, Oakland, CA 94609
3. Applied Biosystems, Foster City, CA 94404.
4. Provincial Hemoglobinopathy DNA Diagnostic Laboratory, and Department of Pathology and Molecular Medicine, McMaster University Faculty of Health Sciences, Hamilton, ON, Canada L8N 3Z5