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Sikes ML, Meade A, Tripathi R, Krangel MS, Oltz EM.Sikes ML, et al. Among authors: oltz em.Proc Natl Acad Sci U S A. 2002 Sep 17;99(19):12309-14. doi: 10.1073/pnas.182166699. Epub 2002 Aug 26.Proc Natl Acad Sci U S A. 2002.PMID: 12196630Free PMC article.