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Koharudin LM, Liu H, Di Maio R, Kodali RB, Graham SH, Gronenborn AM.Koharudin LM, et al.Proc Natl Acad Sci U S A. 2010 Apr 13;107(15):6835-40. doi: 10.1073/pnas.1002295107. Epub 2010 Mar 15.Proc Natl Acad Sci U S A. 2010.PMID: 20231490Free PMC article.