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Park YJ, Luger K.Park YJ, et al. Among authors: luger k.Proc Natl Acad Sci U S A. 2006 Jan 31;103(5):1248-53. doi: 10.1073/pnas.0508002103. Epub 2006 Jan 23.Proc Natl Acad Sci U S A. 2006.PMID: 16432217Free PMC article.