1. Dept. of Chemistry University of British Columbia Vancouver BC, V6T 1Z1 Canada
2. Dept. of Biochemistry and Microbiology University of Victoria Victoria BC, V8W 3P6 Canada
3. Dept. of Chemistry and Dept. of Mol. Biology and Biochemistry Simon Fraser University Burnaby BC, V5A 1S6 Canada
4. Dept. of Medical Genetics University of British Columbia Women's Hospital & Health Centre Vancouver BC, V6H 3N1 Canada
5. Genetics and Molecular Pathology SA Pathology at Women's and Children's Hospital N. Adelaide South Australia 5006 Australia