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Chang EF, Niziolek CA, Knight RT, Nagarajan SS, Houde JF.Chang EF, et al.Proc Natl Acad Sci U S A. 2013 Feb 12;110(7):2653-8. doi: 10.1073/pnas.1216827110. Epub 2013 Jan 23.Proc Natl Acad Sci U S A. 2013.PMID: 23345447Free PMC article.