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Said MR, Begley TJ, Oppenheim AV, Lauffenburger DA, Samson LD.Said MR, et al. Among authors: begley tj.Proc Natl Acad Sci U S A. 2004 Dec 28;101(52):18006-11. doi: 10.1073/pnas.0405996101. Epub 2004 Dec 17.Proc Natl Acad Sci U S A. 2004.PMID: 15608068Free PMC article.