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Busse L, Roberts KC, Crist RE, Weissman DH, Woldorff MG.Busse L, et al. Among authors: weissman dh.Proc Natl Acad Sci U S A. 2005 Dec 20;102(51):18751-6. doi: 10.1073/pnas.0507704102. Epub 2005 Dec 9.Proc Natl Acad Sci U S A. 2005.PMID: 16339900Free PMC article.