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Caspari R, Lee SH.Caspari R, et al.Proc Natl Acad Sci U S A. 2004 Jul 27;101(30):10895-900. doi: 10.1073/pnas.0402857101. Epub 2004 Jul 13.Proc Natl Acad Sci U S A. 2004.PMID: 15252198Free PMC article.