1 Terry Fox Laboratory, British Columbia Cancer Agency, Vancouver, BC V5Z 1L3, Canada.
2 Laboratory of Molecular Gerontology, National Institute on Aging, National Institutes of Health, NIH Biomedical Research Center, Baltimore, MD 21224, USA.
3 Department of Chemistry, Simon Fraser University, Burnaby, BC V5A 1S6, Canada.
4 Department of Pathology and Laboratory Medicine, University of Pennsylvania, Philadelphia, PA 19104-6100, USA.
5 Division of Hematology, Department of Medicine, University of British Columbia, Vancouver, BC V6T 1Z4, Canada.
6 European Research Institute for the Biology of Ageing, University of Groningen, University Medical Centre Groningen, A. Deusinglaan 1, NL-9713 AV Groningen, The Netherlands.