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Walters NB, Egan GF, Kril JJ, Kean M, Waley P, Jenkinson M, Watson JD.Walters NB, et al.Proc Natl Acad Sci U S A. 2003 Mar 4;100(5):2981-6. doi: 10.1073/pnas.0437896100. Epub 2003 Feb 24.Proc Natl Acad Sci U S A. 2003.PMID: 12601170Free PMC article.