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Hupfeld CJ, Dalle S, Olefsky JM.Hupfeld CJ, et al. Among authors: olefsky jm.Proc Natl Acad Sci U S A. 2003 Jan 7;100(1):161-6. doi: 10.1073/pnas.0235674100. Epub 2002 Dec 30.Proc Natl Acad Sci U S A. 2003.PMID: 12509508Free PMC article.