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Demogines A, Farzan M, Sawyer SL.Demogines A, et al. Among authors: sawyer sl.J Virol. 2012 Jun;86(11):6350-3. doi: 10.1128/JVI.00311-12. Epub 2012 Mar 21.J Virol. 2012.PMID: 22438550Free PMC article.