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Knutson MD, Oukka M, Koss LM, Aydemir F, Wessling-Resnick M.Knutson MD, et al.Proc Natl Acad Sci U S A. 2005 Feb 1;102(5):1324-8. doi: 10.1073/pnas.0409409102. Epub 2005 Jan 21.Proc Natl Acad Sci U S A. 2005.PMID: 15665091Free PMC article.