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Purtic B, Pitcher LA, van Oers NS, Wülfing C.Purtic B, et al.Proc Natl Acad Sci U S A. 2005 Feb 22;102(8):2904-9. doi: 10.1073/pnas.0406867102. Epub 2005 Feb 9.Proc Natl Acad Sci U S A. 2005.PMID: 15703298Free PMC article.